How severe is CVE-2023-26477?

CVE-2023-26477 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2023-26477 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 75% (99th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2023-26477?

CVE-2023-26477 affects Xwiki. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2023-26477?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

When was CVE-2023-26477 published?

CVE-2023-26477 was published on 2023-03-02 and last updated on 2026-06-17.

CVE-2023-26477

CVE-2023-26477 is a critical-severity vulnerability in Xwiki with a CVSS 3.x base score of 10.0. Its EPSS exploit-prediction score of 75% places it in the 99th percentile, indicating an elevated likelihood of exploitation. The underlying weakness is classified as CWE-94.

Key facts

Severity: Critical (CVSS 3.x base score 10.0)
EPSS exploit prediction: 75% (99th percentile)
Actively exploited: Not listed in CISA KEV
Weakness: CWE-94
Affected product: Xwiki
Published: 2023-03-02
Last modified: 2026-06-17

Description

XWiki Platform is a generic wiki platform. Starting in versions 6.3-rc-1 and 6.2.4, it's possible to inject arbitrary wiki syntax including Groovy, Python and Velocity script macros via the `newThemeName` request parameter (URL parameter), in combination with additional parameters. This has been patched in the supported versions 13.10.10, 14.9-rc-1, and 14.4.6. As a workaround, it is possible to edit `FlamingoThemesCode.WebHomeSheet` and manually perform the changes from the patch fixing the issue.

Frequently asked questions

What is CVE-2023-26477?: XWiki Platform is a generic wiki platform. Starting in versions 6.3-rc-1 and 6.2.4, it's possible to inject arbitrary wiki syntax including Groovy, Python and Velocity script macros via the `newThemeName` request parameter (URL parameter), in combination with additional parameters. This has been patched in the supported versions 13.10.10, 14.9-rc-1, and 14.4.6. As a workaround, it is possible to edit `FlamingoThemesCode.WebHomeSheet` and manually perform the changes from the patch fixing the issue.
How severe is CVE-2023-26477?: CVE-2023-26477 has a CVSS 3.x base score of 10.0, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2023-26477 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 75% (99th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2023-26477?: CVE-2023-26477 affects Xwiki. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2023-26477?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
When was CVE-2023-26477 published?: CVE-2023-26477 was published on 2023-03-02 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:xwiki:xwiki:*:*:*:*:*:*:*:*

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