AVideo: Stored XSS via Unescaped Plugin Configuration Values in Admin Panel

published 2026-03-31 7 mo ago modified 2026-07-24 3 mo ago also GHSA-v4h7-3x43-qqw4 , EUVD-2026-17634

cvss: 6.1; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.2%; EPSS 0.2% chance of exploitation in 30 days, percentile 13%
public exploits: 0; none known

WWBN AVideo is an open source video platform. In versions 26.0 and prior, the AVideo admin panel renders plugin configuration values in HTML forms without applying htmlspecialchars() or any other output encoding. The jsonToFormElements() function in admin/functions.php directly interpolates user-controlled values into textarea contents, option elements, and input attributes. An attacker who can set a plugin configuration value (either as a compromised admin or by chaining with CSRF on admin/save.json.php) can inject arbitrary JavaScript that executes whenever any administrator visits the plugin configuration page. At time of publication, there are no publicly available patches.

Patch / fix

links 1

github.com/WWBN/AVideo@a93ba83 commit

CISA SSVC

Exploitation: Proof of concept is public
Automatable: no
Technical impact: partial
Assessed: 7 mo ago (2026-04-01)

Exploit prediction

0.23% chance of exploitation in the next 30 days, higher than 13% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

github.com https://github.com/WWBN/AVideo/security/advisories/GHSA-v4h7-3x43-qqw4 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
NVD	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N
GitHub	3.1	6.1	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N

Affected packages

ecosystem	package	affected	fixed in
packagist	wwbn/avideo	<=26.0	no fix listed

Affected products

WWBN AVideo

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

github.com /WWBN/AVideo/commit/a93ba83eb9f3aa47cd16af0a0dc13da3bf8ac4d1
web
github.com /WWBN/AVideo/security/advisories/GHSA-v4h7-3x43-qqw4
exploit, web, vendor-advisory
nvd.nist.gov /vuln/detail/CVE-2026-34396
advisory
github.com /WWBN/AVideo
package

Sources

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary