Is CVE-2015-8623 in the CISA KEV catalog?

No. CVE-2015-8623 is not currently on the CISA Known Exploited Vulnerabilities list.

What is the CVSS severity of CVE-2015-8623?

CVE-2015-8623 has a CVSS v3 base score of 8.8 (HIGH).

What is the EPSS score for CVE-2015-8623?

CVE-2015-8623 has an EPSS score of 0.73% (50th percentile), estimating the probability of exploitation in the next 30 days.

How do I fix CVE-2015-8623?

Upgrade mediawiki on debian 11 to 1:1.25.5-1 or later.

CVE & CISA-KEV Catalog

CVE-2015-8623

HIGH

8.8

CVSS v3

NVD

Description

The User::matchEditToken function in includes/User.php in MediaWiki before 1.23.12 and 1.24.x before 1.24.5 does not perform token comparison in constant time before returning, which allows remote attackers to guess the edit token and bypass CSRF protection via a timing attack, a different vulnerability than CVE-2015-8624.

CWE-352Cross-Site Request Forgery

How to fix

Remediation Available

mediawikiDebian

Fixed in:1:1.25.5-1CVE-2015-8623

Remediation is compiled from vendor and distribution security advisories. Always confirm against the linked source for your exact version and platform.

CVSS v3 Vector

Exploitability

Attack VectorNetwork

Attack ComplexityLow

Privileges RequiredNone

User InteractionRequired

ScopeUnchanged

Impact

ConfidentialityHigh

IntegrityHigh

AvailabilityHigh

CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Exploit Intelligence

0.73%probability of exploitation in 30 days

50thpercentile

Moderate risk: more likely to be exploited than 50% of all known CVEs.

References

Patch4

Third-Party Advisory1

gerrit.wikimedia.org

Related Vulnerabilities

Other CWE-352 (Cross-Site Request Forgery) vulnerabilities, ordered by exploit likelihood. View all

CVE	Severity	CVSS	EPSS	Exploited	Fix
CVE-2016-6277	High	8.8	100%	KEV	-
CVE-2014-0054	Medium	6.8	91%	-	Fix
CVE-2013-6429	Medium	6.8	90%	-	Fix
CVE-2022-41622	High	8.8	88%	-	-
CVE-2018-7700	High	8.8	75%	-	-
CVE-2015-2295	Medium	6.8	66%	-	-

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This product uses NVD data but is not endorsed or certified by the NVD. EPSS scores courtesy of FIRST.org (https://www.first.org/epss). Source: CISA KEV Catalog. Data as of 2026-05-13.