CVE-2025-15671

MEDIUMPre-NVD 5.45.4—
EchelonGraph scoreHIGH confidence

Score 5.4 from GitHub Security Advisory published 2026-08-21. CISA-ADP (Vulnrichment) CVSS v3.1 baseline 5.4; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: cisa-adp, epss, ghsa
Trending — 3 sources updated this week
5.4EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.4Exploit: None knownExposed: 0

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

The Welcart e-Commerce WordPress plugin before 2.12.1 does not regenerate the session identifier on authentication and sets the session identifier from a user-supplied request parameter, allowing an unauthenticated attacker to fixate a shop member's session and take over their customer account after the victim logs in through an attacker-crafted request.

CVSS v3
5.4
EG Score
5.4(high)
EG Risk
29(Track)
EG Risk 29/100SSVC: 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
Severity54% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
7%
KEV
Not listed

Published

August 21, 2026

Last Modified

August 26, 2026

Advisory Details (1)

Auto-updated Aug 21, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

Welcart e-Commerce < 2.12.1 – Session Fixation via uscesid Parameter | CVE 2025-15671 | Plugin Vulnerabilities

https://wpscan.com/vulnerability/3b2d4e7f-1e2a-4712-af9b-50080106d52c/

Vendor Advisories for CVE-2025-15671(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 17× in last 7d / 26× 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. 2026-08-29 20:27 UTCEG score recompute
  2. 2026-08-29 20:27 UTCGHSA enrichment
  3. 2026-08-28 21:40 UTCEPSS rescore
  4. 2026-08-28 19:26 UTCGHSA enrichment
  5. 2026-08-27 18:19 UTCEG score recompute
  6. 2026-08-27 18:19 UTCGHSA enrichment
  7. 2026-08-27 14:24 UTCEPSS rescore
  8. 2026-08-26 16:48 UTCEG score recompute
  9. 2026-08-26 16:48 UTCGHSA enrichment
  10. 2026-08-26 14:45 UTCEPSS rescore
  11. 2026-08-25 17:58 UTCGHSA enrichment
  12. 2026-08-24 16:56 UTCEG score recompute
  13. 2026-08-24 16:56 UTCGHSA enrichment
  14. 2026-08-24 14:15 UTCEPSS rescore
  15. 2026-08-23 15:20 UTCEG score recompute
  16. 2026-08-23 15:20 UTCGHSA enrichment
  17. 2026-08-23 00:18 UTCEPSS rescore
  18. 2026-08-22 14:20 UTCEG score recompute
  19. 2026-08-22 14:20 UTCGHSA enrichment
  20. 2026-08-21 23:48 UTCEPSS rescore
  21. 2026-08-21 13:20 UTCEG score recompute▲ 5.40
  22. 2026-08-21 13:20 UTCGHSA enrichment
  23. 2026-08-21 13:19 UTCNVD updateCVSS v3 → 5.4 · severity → MEDIUM
  24. 2026-08-21 07:34 UTCNVD update
  25. 2026-08-21 06:20 UTCEG score recompute
Show 1 more
  1. 2026-08-21 06:19 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2025-15671?
CVE-2025-15671 is a medium vulnerability published on August 21, 2026. The Welcart e-Commerce WordPress plugin before 2.12.1 does not regenerate the session identifier on authentication and sets the session identifier from a user-supplied request parameter, allowing an unauthenticated attacker to fixate a shop member's session and take over their customer account…
When was CVE-2025-15671 disclosed?
CVE-2025-15671 was first published in the National Vulnerability Database on August 21, 2026, with the most recent update on August 26, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2025-15671 actively exploited?
CVE-2025-15671 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 92.7% of all scored CVEs.
What is the CVSS score of CVE-2025-15671?
CVE-2025-15671 has a CVSS v3.1 base score of 5.4 (CISA-ADP / Vulnrichment enrichment; NVD's own analysis pending).
How do I remediate CVE-2025-15671?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-15671, 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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