What is CVE-2021-29459?

CVE-2021-29459 is a critical-severity vulnerability in Xwiki, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2021-04-20.

How severe is CVE-2021-29459?

Critical severity. CVSS v3 base score is 9.6 out of 10.

Is CVE-2021-29459 known to be exploited?

3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

XSS in Xwiki

CVE-2021-29459

XWiki Platform is a generic wiki platform offering runtime services for applications built on top of it. It is possible to persistently inject scripts in XWiki versions prior to 12.6.3 and 12.8. Unregistred users can fill simple text fields. Registered users can fill in their personal information and (if they have edit rights) fill the values of static lists using App Within Minutes. There is no easy workaround except upgrading XWiki. The vulnerability has been patched on XWiki 12.8 and 12.6.3.

Vulnerability class: XSS (Cross-Site Scripting)

EPSS: 0.011 (62.9th percentile) — read the EPSS interpretation.

CVSS v3 metric

CVSS v3 base score 9.6 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:L.

Affected products

Xwiki
Xwiki Xwiki-platform — versions < 12.6.3, >= 12.6.4, < 12.8

Weakness classification (CWE)

CWE-79 — Cross-site Scripting

Public proof-of-concept exploits

References

security-advisories@github.com (x_refsource_CONFIRM, Exploit, Third Party Advisory)

Frequently asked questions

What is CVE-2021-29459?: CVE-2021-29459 is a critical-severity vulnerability in Xwiki, classified under Cross-site Scripting. CVSS score: 9.6/10. Published 2021-04-20.
How severe is CVE-2021-29459?: Critical severity. CVSS v3 base score is 9.6 out of 10.
Is CVE-2021-29459 known to be exploited?: 3 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.