CSIRTS // UNIFIED SECURITY ADVISORY FEEDSYS ● ONLINE · POWERED BY INTELFUSIONS.COM

← Back to feed

[UPDATE] [medium] Znuny: Vulnerability enables Cross-Site Scripting

mediumCVE-2026-77506
An attacker can exploit a vulnerability in Znuny to conduct a Cross-Site Scripting attack.

CSIRTS triage

vendor: Znunyproduct: ZnunyCross-site scripting
What
A vulnerability in Znuny enables attackers to conduct cross-site scripting attacks.
Who is affected
All deployments of Znuny are affected.
Urgency
Medium urgency; cross-site scripting can compromise user sessions and data, though not currently known to be exploited.
Action
Update Znuny to a patched version addressing CVE-2026-77506.

AI-assisted analysis generated from the source advisory — verify against the original.

⚡ Watch Znuny

Get an email when a new Znuny advisory drops — max one per day, one-click unsubscribe.

Details

Source
CERT-Bund (BSI) Security Advisories (DE · national-cert · site)
Severity
medium
Published
2026-08-21
Exploitation
Not in CISA KEV at last sync
Language
Machine-translated to English — verify against the original

Original advisory: https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-2084

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-77506coverage & exploitation statusNVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

Recent advisories for Znuny

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

More from CERT-Bund (BSI) Security Advisories