CVE-2015-8351

CRITICALNVD 9.09.0—
EchelonGraph scoreMEDIUM confidence

Score 9.0 from GitHub Security Advisory (severity: CRITICAL) published 2022-05-14. NVD baseline CVSS 9.0; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Elevated
9.0
EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.
  • High severity, but no confirmed exploitation yet
CISA-KEV: Not listedEPSS: 37%CVSS: 9.0Exploit: NoneExposed: 0

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

PHP remote file inclusion vulnerability in the Gwolle Guestbook plugin before 1.5.4 for WordPress, when allow_url_include is enabled, allows remote authenticated users to execute arbitrary PHP code via a URL in the abspath parameter to frontend/captcha/ajaxresponse.php. NOTE: this can also be leveraged to include and execute arbitrary local files via directory traversal sequences regardless of whether allow_url_include is enabled.

CVSS v3
9.0
EG Score
9.0(medium)
EPSS
98.3%
KEV
Not listed

Published

September 11, 2017

Last Modified

May 13, 2026

Advisory Details (3)

Auto-updated May 22, 2026
🔬 Proof of concept available. No patch confirmed yet.
generic🟡 PoC Available

WordPress Plugin Gwolle Guestbook 1.5.3 - Remote File Inclusion - PHP webapps Exploit

https://www.exploit-db.com/exploits/38861/
generic

Gwolle Guestbook – WordPress plugin | WordPress.org

https://wordpress.org/plugins/gwolle-gb/changelog/
generic
http://www.securityfocus.com/archive/1/537020/100/0/threaded

Data Freshness Timeline

(refreshed 3× in last 7d / 27× 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. 2026-07-06 16:24 UTCEPSS rescore
  2. 2026-07-06 02:20 UTCEPSS rescore
  3. 2026-07-01 15:02 UTCEPSS rescore
  4. 2026-06-28 04:53 UTCEPSS rescore
  5. 2026-06-27 03:05 UTCEPSS rescore
  6. 2026-06-25 13:47 UTCEPSS rescore
  7. 2026-06-25 13:47 UTCEPSS rescore
  8. 2026-06-24 14:02 UTCEPSS rescore
  9. 2026-06-24 14:02 UTCEPSS rescore
  10. 2026-06-23 21:30 UTCEPSS rescore
  11. 2026-06-21 01:57 UTCEPSS rescore
  12. 2026-06-21 01:57 UTCEPSS rescore
  13. 2026-06-19 19:23 UTCEPSS rescore
  14. 2026-06-19 19:23 UTCEPSS rescore
  15. 2026-06-18 17:50 UTCEPSS rescore
  16. 2026-06-17 17:50 UTCEPSS rescore
  17. 2026-06-17 17:49 UTCEPSS rescore
  18. 2026-06-16 17:50 UTCEPSS rescore
  19. 2026-06-16 17:50 UTCEPSS rescore
  20. 2026-06-15 17:45 UTCEPSS rescore
  21. 2026-06-14 23:14 UTCEPSS rescore
  22. 2026-06-12 23:09 UTCEPSS rescore
  23. 2026-06-12 23:09 UTCEPSS rescore
  24. 2026-06-11 13:57 UTCEPSS rescore
  25. 2026-06-11 13:57 UTCEPSS rescore
Show 26 more
  1. 2026-06-10 22:15 UTCEPSS rescore
  2. 2026-06-08 14:14 UTCEPSS rescore
  3. 2026-06-07 15:22 UTCEPSS rescore
  4. 2026-06-05 22:44 UTCEPSS rescore
  5. 2026-06-05 06:08 UTCEPSS rescore
  6. 2026-06-05 06:08 UTCEPSS rescore
  7. 2026-06-04 13:10 UTCEPSS rescore
  8. 2026-06-04 13:10 UTCEPSS rescore
  9. 2026-06-02 20:10 UTCEPSS rescore
  10. 2026-06-01 13:49 UTCEPSS rescore
  11. 2026-06-01 13:49 UTCEPSS rescore
  12. 2026-05-29 13:41 UTCEPSS rescore
  13. 2026-05-27 13:38 UTCEPSS rescore
  14. 2026-05-27 13:38 UTCEPSS rescore
  15. 2026-05-26 13:41 UTCEPSS rescore
  16. 2026-05-26 07:16 UTCEPSS rescore
  17. 2026-05-26 07:16 UTCEPSS rescore
  18. 2026-05-24 16:43 UTCEPSS rescore
  19. 2026-05-22 21:15 UTCEPSS rescore
  20. 2026-05-22 09:57 UTCEG score recompute
  21. 2026-05-22 09:57 UTCGHSA enrichment
  22. 2026-05-21 22:40 UTCEPSS rescore
  23. 2026-05-20 22:37 UTCEPSS rescore
  24. 2026-05-20 22:37 UTCEPSS rescore
  25. 2026-05-18 21:30 UTCEPSS rescore
  26. 2026-05-18 21:30 UTCEPSS rescore

Publicly available exploits

(2 references)

Working exploit code is in the public domain (1 GitHub PoC) (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

  • GitHub PoCG4sp4rCS/exploit-CVE-2015-8351
    First seen May 8, 2023

    WordPress Plugin Gwolle Guestbook 1.5.3 - Remote File Inclusion

    Open source ↗
  • Exploit-DBEDB-38861
    First seen Dec 3, 2015

    WordPress Plugin Gwolle Guestbook 1.5.3 - Remote File Inclusion

    Open source ↗

Frequently asked(5)

What is CVE-2015-8351?
CVE-2015-8351 is a critical vulnerability published on September 11, 2017. PHP remote file inclusion vulnerability in the Gwolle Guestbook plugin before 1.5.4 for WordPress, when allowurlinclude is enabled, allows remote authenticated users to execute arbitrary PHP code via a URL in the abspath parameter to frontend/captcha/ajaxresponse.php. NOTE: this can also be…
When was CVE-2015-8351 disclosed?
CVE-2015-8351 was first published in the National Vulnerability Database on September 11, 2017, with the most recent update on May 13, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2015-8351 actively exploited?
CVE-2015-8351 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 98.3% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.
What is the CVSS score of CVE-2015-8351?
CVE-2015-8351 has a CVSS v3 base score of 9.0 (NVD).
How do I remediate CVE-2015-8351?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2015-8351, 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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