CVE-2026-115541: HumHub HumHub Community Edition

HumHub 1.19.0 - Stored cross-site scripting in friendship confirmation

CVSS 7.2 HighEPSS 0.0040 · 34th percentile

Published by the CVE Program (CNA: Fluid Attacks) at 3 Nov 2026, 21:59 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
HumHub	HumHub Community Edition	affected before 1.18.7 semver affected 1.19.0 to before 1.19.1 semver Other versions: unaffected

Identifiers

CVE-2026-115541

CNA

Fluid Attacks

Weakness (CWE)

CWE-79

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

Score	Rating	CVSS	Vector	Source
7.2	High	4.0	CVSS:4.0/AV:N/AC:L/AT:P/PR:L/UI:A/VC:H/VI:H/VA:N/SC:L/SI:L/SA:N	CNA (Fluid Attacks)

CISA KEV Not listed.
EPSS 0.0040, the 34th percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

3 Nov 2026, 21:59 UTC Confirmed by the CVE List
3 Nov 2026, 22:08 UTC First seen by agentprime
3 Nov 2026, 22:19 UTC Confirmed by NVD

Sources

References from the CNA

fluidattacks.com/advisories/toujours third-party-advisory
github.com/humhub/humhub product
github.com/humhub/humhub/security/advisories/GHSA-ph8x-wg86-qp2m vendor-advisory
github.com/humhub/humhub/pull/8624 patch
github.com/humhub/humhub/pull/8625 patch
github.com/humhub/humhub/releases/tag/v1.19.3 release-notes
github.com/humhub/humhub/releases/tag/v1.18.7 release-notes

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.