HumHub 1.19.0 - Stored cross-site scripting in friendship confirmation
Only HumHub installs with friendships enabled and the display name built from first and last name are affected. Fixed in HumHub 1.18.7 and 1.19.1.
Written by anthropic/claude-haiku-5.5 from the sources below. Verify against them.
- Exploited
- No known exploitation
- Fix
- Fixed in 1.18.7, 1.19.1
- Who is exposed
- Specific setups only
Do first: Check whether your setup matches what the bug needs. Friendships enabled and the display name built from first and last name HumHub version >= 1.19.0 and < 1.19.1, or < 1.18.7
- Exploitation?/40Exploitation: unknown (data gap). No CISA SSVC exploitation rating yet
- Exposure8/25Specific setups only, reachable over the network
- Reach?/20Reach: unknown (data gap). No tracked technology or package matched
- Severity7.2/10CVSS 7.2
- No patch0/5No signal
What would change the score
- Would score about 65 if added to CISA KEV
- Would score about 60 if CISA's SSVC rates exploitation active
- Would score about 22 if CISA's SSVC rates it automatable
CVE-2026-115541 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 7.2 (high) and affects HumHub Community Edition; fixed in 1.18.7 and 1.19.1.
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- Published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- 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? →
- 15/100 · 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? →
- Specific setups only
- Fix
- Fixed in 1.18.7, 1.19.1
- 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
HumHub, an open-source social networking platform, is affected by a flaw that lets a logged-in member store malicious scripts in their name, which then run in the browser of other users who view the friendship confirmation prompt. This could allow an attacker to act on behalf of a victim within the HumHub site, such as performing actions or accessing data available to that user's session.
Read the original description
HumHub Community Edition 1.19.0 contains a stored cross-site scripting vulnerability in the friendship confirmation dialog. An authenticated low-privileged member can save HTML in their first and last name. When another authenticated user clicks Friends for that profile, HumHub places the decoded display name into a modal through jQuery html(), causing attacker-controlled markup to execute in the victim's HumHub origin.
What to do
Check whether your setup matches what the bug needs.
Friendships enabled and the display name built from first and last name HumHub version >= 1.19.0 and < 1.19.1, or < 1.18.7Upgrade to a fixed version: 1.18.7, 1.19.1.
Workaround: Disable "Enable user friendship system" under Administration > Settings > General, or set the display name format to the username under Administration > Settings > Appearance.
Timeline
- CVE published
- First seen by cve.now
Affected versions
- HumHub HumHub Community Edition
fixed in 1.18.7; From 1.19.0 · fixed in 1.19.1
Evidence 7
- Advisory
- Patch
- Patch
- Repository
- Repository
Show all 7 sourcesShow fewer sources
- Repository
- Link
Corrections
None so far.
Something wrong on this page? Report an error. Every fix is listed here.
Questions about CVE-2026-115541
Is CVE-2026-115541 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?
A stored cross-site scripting flaw in the friendship confirmation flow lets attacker-controlled JavaScript run in the browser session of any user who clicks the Friends button. This includes System Administrators, and the script can perform same-origin actions the victim is allowed to perform.Source: github.com
Which versions are affected by CVE-2026-115541?
HumHub Community Edition: before 1.18.7; from 1.19.0 before 1.19.1.Source: cve.now feed data
Am I affected, and how do I check?
HumHub Community Edition versions before 1.18.7, and versions 1.19.0 up to but not including 1.19.1, are affected. Only installations with friendships enabled and the display name built from first and last name are affected; to check, look at the "Enable user friendship system" setting under Administration > Settings > General and the display name format under Administration > Settings > Appearance.Source: github.com
How do I fix CVE-2026-115541?
Upgrade to HumHub 1.18.7 if you run the 1.18 line, or to HumHub 1.19.1 if you run the 1.19 line. Until then, the advisory's workaround is to disable the friendship system or set the display name format to the username.Source: github.com