CVE-2026-43883

MEDIUMNVD 4.24.2—
EchelonGraph scoreMEDIUM confidence

Score 4.2 from GitHub Security Advisory published 2026-05-05. NVD baseline CVSS 4.2; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this weekElevated
4.2
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS: 0%CVSS: 4.2Exploit: NoneExposed: 0

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

WWBN AVideo is an open source video platform. In versions up to and including 29.0, plugin/PayPalYPT/agreementCancel.json.php cancels a PayPal billing agreement using an attacker-supplied agreement parameter without verifying that the authenticated user owns the agreement. A low-privilege authenticated user who learns or obtains another user's PayPal billing agreement ID can silently suspend the victim's recurring subscription, causing revenue loss to the platform and loss of paid service to the victim. Commit 0da3dcff1eda2f497694bf82b559829471c292c2 contains an updated fix.

CVSS v3
4.2
EG Score
4.2(medium)
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
Severity42% × 45%
Exploitation40% × 40%
Automatability0% × 15%
Action: Routine — remediate on your standard cadence.
EPSS
6.4%
KEV
Not listed

Published

May 11, 2026

Last Modified

May 12, 2026

Advisory Details (2)

Auto-updated May 12, 2026
🔬 Proof of concept available. Patch available. Sources: github.
github Patch Available🟡 PoC Available

IDOR in PayPalYPT agreementCancel.json.php Allows Any Authenticated User to Cancel Arbitrary PayPal Subscription Agreements · Advisory · WWBN/AVideo · GitHub

https://github.com/WWBN/AVideo/security/advisories/GHSA-958h-qp3x-q4gj
generic

fix: Ensure only agreement owners can cancel their agreements · WWBN/AVideo@0da3dcf · GitHub

https://github.com/WWBN/AVideo/commit/0da3dcff1eda2f497694bf82b559829471c292c2

Patch Availability(1)

Vendor / EcosystemFixed in / PatchReleasedSource
composerwwbn/avideo—ghsa

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Affected Packages

(1 across 1 ecosystem)
Packagist(1)
PackageVulnerable rangeFixed inDependents
wwbn/avideo10.4 ... 29.0 (18 versions)——

Weakness Classification(1)

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

Data Freshness Timeline

(refreshed 9× in last 7d / 35× 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. 2026-07-23 03:14 UTCEG score recompute
  2. 2026-07-22 14:08 UTCEPSS rescore
  3. 2026-07-21 15:24 UTCEPSS rescore
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  9. 2026-07-16 12:49 UTCOSV refresh
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  1. 2026-06-28 14:07 UTCEPSS rescore
  2. 2026-06-28 11:44 UTCGHSA enrichment
  3. 2026-06-28 04:56 UTCEPSS rescore
  4. 2026-06-27 08:49 UTCGHSA enrichment
  5. 2026-06-27 03:08 UTCEPSS rescore
  6. 2026-06-26 04:17 UTCGHSA enrichment
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  21. 2026-06-16 07:01 UTCGHSA enrichment
  22. 2026-06-15 17:49 UTCEPSS rescore
  23. 2026-06-15 02:27 UTCGHSA enrichment
  24. 2026-06-14 01:21 UTCGHSA enrichment
  25. 2026-06-13 23:00 UTCEPSS rescore
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  28. 2026-06-12 18:57 UTCGHSA enrichment
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  32. 2026-06-10 16:43 UTCGHSA enrichment
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  35. 2026-06-09 15:37 UTCGHSA enrichment
  36. 2026-06-08 14:31 UTCGHSA enrichment
  37. 2026-06-08 14:17 UTCEPSS rescore
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  41. 2026-06-07 13:25 UTCGHSA enrichment
  42. 2026-06-06 12:19 UTCGHSA enrichment
  43. 2026-06-05 22:47 UTCEPSS rescore
  44. 2026-06-05 11:13 UTCGHSA enrichment
  45. 2026-06-05 06:10 UTCEPSS rescore
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  49. 2026-06-04 10:07 UTCGHSA enrichment
  50. 2026-06-03 09:01 UTCGHSA enrichment
  51. 2026-06-02 20:13 UTCEPSS rescore
  52. 2026-06-02 07:54 UTCGHSA enrichment
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  55. 2026-06-01 06:48 UTCGHSA enrichment
  56. 2026-05-31 22:30 UTCEPSS rescore
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  70. 2026-05-20 13:05 UTCEG score recompute
  71. 2026-05-20 13:05 UTCGHSA enrichment
  72. 2026-05-20 11:22 UTCEPSS rescore

Related CVEs(same product + same CWE)

Frequently asked(5)

What is CVE-2026-43883?
CVE-2026-43883 is a medium vulnerability published on May 11, 2026. WWBN AVideo is an open source video platform. In versions up to and including 29.0, plugin/PayPalYPT/agreementCancel.json.php cancels a PayPal billing agreement using an attacker-supplied agreement parameter without verifying that the authenticated user owns the agreement. A low-privilege…
When was CVE-2026-43883 disclosed?
CVE-2026-43883 was first published in the National Vulnerability Database on May 11, 2026, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-43883 actively exploited?
CVE-2026-43883 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 6.4% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2026-43883?
CVE-2026-43883 has a CVSS v3 base score of 4.2 (NVD).
How do I remediate CVE-2026-43883?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-43883, 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.

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