CVE
Six Apart remote code execution in Dynamic Publishing
- Exploited
- No known exploitation
- Fix
- See vendor advisory
- Who is exposed
- Not reported
Do first: Workaround: Set the DynamicTemplateAllowPHP environment variable to 0 to prevent execution of PHP code embedded in design templates.
- Last modified
- Whether it needs action now or is a reference record, by fixed rules, with why. Last checked is when cve.now last re-read it.What do these mean? →
- Reference
- Last checked
- FIRST's estimate of the chance attackers exploit it in the next 30 days, updated daily.What do these mean? →
- 0.31% · 23rd percentile
- A 0-100 score for how much a CVE matters across the industry: exploitation, exposure, how widely the software is used, severity and whether a fix exists.What do these mean? →
- 29/100 · provisional
- How many real-world setups can hit the bug, from the vendor's advisory and CISA data. It does not know your setup.What do these mean? →
- Unclear
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
Movable Type, Movable Type Advanced, Movable Type Premium, and Movable Type Premium Advanced Edition from Six Apart Ltd. contain a code injection flaw in the Dynamic Publishing functionality. A remote attacker without logging in can send a specially crafted request that makes the product run arbitrary PHP code on the affected system.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
Read the original description
Movable Type provided by Six Apart Ltd. contains a code injection vulnerability in its Dynamic Publishing functionality. By sending a specially crafted request that is processed by the Dynamic Publishing, an attacker may be able to execute arbitrary PHP code on the affected product.
Who should check
Teams running Movable Type 8.8.6 or earlier, 8.0.13 or earlier, 8.4.x or 7.x, or Movable Type Premium 2.18 or earlier, including Advanced editions.
cve.now Index
- Exploitation?/40Unknown. No CISA SSVC exploitation rating yet
- Exposure17/25No login or user action needed, reachable over the network without a login · Unknown: Advisories don't say whether default setups are affected
- Reach?/20Unknown. No tracked technology or package matched
- Severity7.3/10CVSS 7.3
- No patch5/5No fixed version listed; see vendor advisory
What would change the score
- Would score about 74 if added to CISA KEV
- Would score about 69 if CISA's SSVC rates exploitation active
- Would score about 34 if advisories confirm default setups are exposed
What to do
Workaround: Set the DynamicTemplateAllowPHP environment variable to 0 to prevent execution of PHP code embedded in design templates.
Check your systems with an agent
Paste this into a coding or ops agent. It checks your systems read-only and reports a table per asset.
Check whether my systems are affected by CVE-2026-117687 (Movable Type provided by Six Apart Ltd.), using the cve.now data below.
Rules: work read-only. Do not run exploit code, proof-of-concept scripts or scanners that send attack payloads, and do not change any configuration, package, image or deployment. Report findings only.
What cve.now has for CVE-2026-117687 (entry last updated 2026-11-12):
Affected:
- Six Apart Ltd. Movable Type: from 8.8.0, through 8.8.6
- Six Apart Ltd. Movable Type Advanced: from 8.8.0, through 8.8.6
- Six Apart Ltd. Movable Type: from 8.0.0, through 8.0.13
- Six Apart Ltd. Movable Type Advanced: from 8.0.0, through 8.0.13
- Six Apart Ltd. Movable Type Premium: from 2.00, through 2.18
- Six Apart Ltd. Movable Type Premium Advanced Edition: from 2.00, through 2.18
Fixed versions: none listed yet.
Conditions (all must be true for the bug to be hit):
- Movable Type 8.8.x up to 8.8.6, 8.0.x up to 8.0.13, or Movable Type Premium 2.x up to 2.18, including Advanced editions. (source: https://jvn.jp/en/jp/JVN11786640/)
- Movable Type 8.4.x and 7.x series, which have reached end of life, are also affected. (source: https://jvn.jp/en/jp/JVN11786640/)
- PHP code in template processing results runs for specific MT tags, modifiers, and dynamic publishing error display processing. (source: https://movabletype.org/news/2026/11/mt-887-released.html)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, no login, no user action.
Workaround: Set the DynamicTemplateAllowPHP environment variable to 0 to prevent execution of PHP code embedded in design templates. (source: https://jvn.jp/en/jp/JVN11786640/)
CISA KEV: CVE-2026-117687 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-117687 only. If you also check another CVE, look up its own KEV status; never assume it from this one.
How to check:
- Installed software: check what is actually running, not what a repo declares. Read the version from each host, container image and Kubernetes node (the binary's version output, the OS package database, image layers), and check whether the conditions above hold there. Distribution packages may carry a backported fix under an older version number; confirm against the distribution's own advisory.
Verify against the linked advisories before concluding, and cite the date you read each one:
- https://movabletype.org/news/2026/11/mt-887-released.html
- https://www.sixapart.jp/movabletype/news/2026/11/11-1100.html
- https://jvn.jp/en/jp/JVN11786640/
Do not conclude an asset is unaffected unless you checked it and the evidence covers both its version and the conditions above. If you could not check something, mark it unknown and say what is missing.
Report a table with one row per asset and these columns: Asset | Version or build | Status (affected, fixed, not applicable, unknown) | Compensating controls | Exposure (internet-facing, internal, none) | Evidence | Next action.
Entry: https://cve.now/CVE-2026-117687
For follow-up questions, use the cve.now MCP server at https://mcp.cve.now/mcp (no authentication), for example execute with name cve.get and arguments {"id": "CVE-2026-117687"}.Timeline
- CVE published
- First seen by cve.now
Affected versions
- Six Apart Ltd. Movable Type
From 8.8.0 · through 8.8.6
- Six Apart Ltd. Movable Type Advanced
From 8.8.0 · through 8.8.6
- Six Apart Ltd. Movable Type
From 8.0.0 · through 8.0.13
- Six Apart Ltd. Movable Type Advanced
From 8.0.0 · through 8.0.13
- Six Apart Ltd. Movable Type Premium
From 2.00 · through 2.18
- Six Apart Ltd. Movable Type Premium Advanced Edition
From 2.00 · through 2.18
Evidence 5
CVE record · 2
Establishes: The identifier and description.
- Record
- Record
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-117687
Is CVE-2026-117687 being exploited?
It is not in CISA's Known Exploited Vulnerabilities catalog, and CISA's SSVC assessment does not mark exploitation as active. That does not mean it has not been attacked: vendors and researchers can report attacks before CISA lists them. No public exploit code is tracked.Source: cve.now feed data
What does this mean?
PHP code contained in template processing results was executed for specific MT tags, modifiers, and error display processing. The advisory says an attacker may be able to execute arbitrary PHP code on the affected product.Source: jvn.jp, movabletype.org
Which versions are affected by CVE-2026-117687?
Movable Type: from 8.8.0 through 8.8.6. Movable Type Advanced: from 8.8.0 through 8.8.6. Movable Type: from 8.0.0 through 8.0.13. Movable Type Advanced: from 8.0.0 through 8.0.13. Movable Type Premium: from 2.00 through 2.18. 1 more package is listed on the page.Source: cve.now feed data
Am I affected, and how do I check?
The advisory lists Movable Type 8.8.x up to 8.8.6, 8.0.x up to 8.0.13, and Movable Type Premium 2.x up to 2.18, including Advanced editions. It also says the end-of-life 8.4.x and 7.x series are affected. To check a installation, compare its installed version number with these ranges.Source: jvn.jp, movabletype.org
How do I fix CVE-2026-117687?
The advisory says fixed versions have been released, but the checked facts do not name them or give patch identifiers. Use the vendor's advisory to find the fixed version for your product line.Source: jvn.jp, movabletype.org
What if there's no patch?
Set the DynamicTemplateAllowPHP environment variable to 0 to prevent execution of PHP code embedded in design templates. This is the vendor's stated workaround.Source: jvn.jp, movabletype.org