CVE-2026-88871

MEDIUMPre-NVD 4.34.3—
EchelonGraph scoreHIGH confidence

Score 4.3 from GitHub Security Advisory published 2026-09-10. a secondary CVSS source baseline 4.3; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, secondary
Trending — 3 sources updated this weekElevated
4.3EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 4.3Exploit: Elevated riskExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 (master, 2026-08-23) contains a cross-site request forgery vulnerability in the CustomizeUser plugin's plugin/CustomizeUser/setSubscribers.json.php endpoint. The script reads users_id and ExtraSubscribers from $_REQUEST and calls User::setExtraSubscribers() without requiring a POST request or a valid CSRF token; autoCSRFGuard() is applied only to POST requests to *.json.php, and the mutation does not pass through ObjectYPT::save()/isUntrustedRequest(), so a cross-origin GET succeeds. An unauthenticated remote attacker who induces a logged-in administrator to load a crafted page (for example an tag pointing at the endpoint) can forge the ExtraSubscribers count displayed on any user's channel. The CustomizeUser plugin is enabled by default, and no patched version was available at the time of reporting.

CVSS v3
4.3
EG Score
4.3(high)
EG Risk
35(Track)
EG Risk 35/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity43% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

September 10, 2026

Last Modified

September 15, 2026

Advisory Details (2)

Auto-updated Sep 10, 2026
🔬 Proof of concept available. Patch available. Sources: github.
generic

WWBN AVideo CustomizeUser setSubscribers CSRF via GET | Advisories | VulnCheck

https://www.vulncheck.com/advisories/wwbn-avideo-customizeuser-setsubscribers-csrf-via-get
github Patch Available🟡 PoC Available

GET-reachable CSRF on CustomizeUser setSubscribers.json.php forges ExtraSubscribers counts · Advisory · WWBN/AVideo · GitHub

https://github.com/WWBN/AVideo/security/advisories/GHSA-p9c3-prq7-g8xc

Vendor Advisories for CVE-2026-88871(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 20× in last 7d / 48× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-09-25 04:35 UTCEG score recompute
  2. 2026-09-25 04:35 UTCGHSA enrichment
  3. 2026-09-24 14:04 UTCEPSS rescore
  4. 2026-09-24 05:42 UTCEG score recompute
  5. 2026-09-24 05:42 UTCGHSA enrichment
  6. 2026-09-23 17:54 UTCEPSS rescore
  7. 2026-09-23 06:49 UTCEG score recompute
  8. 2026-09-23 06:49 UTCGHSA enrichment
  9. 2026-09-22 16:01 UTCEPSS rescore
  10. 2026-09-22 07:56 UTCEG score recompute
  11. 2026-09-22 07:56 UTCGHSA enrichment
  12. 2026-09-21 21:09 UTCEPSS rescore
  13. 2026-09-21 09:03 UTCEG score recompute
  14. 2026-09-21 09:03 UTCGHSA enrichment
  15. 2026-09-20 20:16 UTCEPSS rescore
  16. 2026-09-20 10:10 UTCEG score recompute
  17. 2026-09-20 10:10 UTCGHSA enrichment
  18. 2026-09-19 11:16 UTCGHSA enrichment
  19. 2026-09-18 12:23 UTCEG score recompute
  20. 2026-09-18 12:23 UTCGHSA enrichment
  21. 2026-09-17 19:32 UTCEPSS rescore
  22. 2026-09-17 13:30 UTCGHSA enrichment
  23. 2026-09-16 14:27 UTCEG score recompute
  24. 2026-09-16 14:27 UTCGHSA enrichment
  25. 2026-09-16 14:09 UTCEPSS rescore
Show 23 more
  1. 2026-09-16 05:15 UTCEPSS rescore
  2. 2026-09-15 15:34 UTCEG score recompute
  3. 2026-09-15 15:34 UTCGHSA enrichment
  4. 2026-09-15 14:35 UTCEG score recompute
  5. 2026-09-15 14:35 UTCGHSA enrichment
  6. 2026-09-15 09:43 UTCEG score recompute
  7. 2026-09-15 09:43 UTCGHSA enrichment
  8. 2026-09-15 03:12 UTCEPSS rescore
  9. 2026-09-14 10:49 UTCEG score recompute
  10. 2026-09-14 10:49 UTCGHSA enrichment
  11. 2026-09-13 16:48 UTCEPSS rescore
  12. 2026-09-13 11:56 UTCEG score recompute
  13. 2026-09-13 11:56 UTCGHSA enrichment
  14. 2026-09-12 15:02 UTCEPSS rescore
  15. 2026-09-12 13:03 UTCEG score recompute
  16. 2026-09-12 13:03 UTCGHSA enrichment
  17. 2026-09-11 14:53 UTCEPSS rescore
  18. 2026-09-11 14:53 UTCEPSS rescore
  19. 2026-09-11 14:10 UTCEG score recompute
  20. 2026-09-11 14:10 UTCGHSA enrichment
  21. 2026-09-10 14:20 UTCEG score recompute
  22. 2026-09-10 13:20 UTCEG score recompute
  23. 2026-09-10 13:20 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-88871?
CVE-2026-88871 is a medium vulnerability published on September 10, 2026. WWBN AVideo through commit c3edcc274c389816d434acadac07ee78eaf330c1 (master, 2026-08-23) contains a cross-site request forgery vulnerability in the CustomizeUser plugin's plugin/CustomizeUser/setSubscribers.json.php endpoint. The script reads usersid and ExtraSubscribers from $REQUEST and calls…
When was CVE-2026-88871 disclosed?
CVE-2026-88871 was first published in the National Vulnerability Database on September 10, 2026, with the most recent update on September 15, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-88871 actively exploited?
CVE-2026-88871 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 93.2% of all scored CVEs.
What is the CVSS score of CVE-2026-88871?
CVE-2026-88871 has a CVSS v3 base score of 4.3 (NVD).
How do I remediate CVE-2026-88871?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-88871, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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