What is CVE-2023-26261?

CVE-2023-26261 is a critical-severity vulnerability in Ubikasec Waap Cloud, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.8/10. Published 2023-03-08.

How severe is CVE-2023-26261?

Critical severity. CVSS v3 base score is 9.8 out of 10.

Vulnerability in Ubikasec Waap Cloud

CVE-2023-26261

In UBIKA WAAP Gateway/Cloud through 6.10, a blind XPath injection leads to an authentication bypass by stealing the session of another connected user. The fixed versions are WAAP Gateway & Cloud 6.11.0 and 6.5.6-patch15.

Published 2023-03-08 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.008 (56.3th percentile), scored 2026-10-02.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 56th percentile — 56.3% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.008 · newest: 0.008 · change: 0.000

Affected products

Ubikasec Waap Cloud — versions 6.5.6
Ubikasec Waap Gateway — versions 6.5.6

Weakness classification (CWE)

CWE-74 — Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection)

References

documentation.ubikasec.com/x/CQDAAw (Product)
gist.github.com/Jakick/7d1635b886654ddd0e476b3c79a7ba9f (Third Party Advisory)

Frequently asked questions

What is CVE-2023-26261?: CVE-2023-26261 is a critical-severity vulnerability in Ubikasec Waap Cloud, classified under Improper Neutralization of Special Elements in Output Used by a Downstream Component (Injection). CVSS score: 9.8/10. Published 2023-03-08.
How severe is CVE-2023-26261?: Critical severity. CVSS v3 base score is 9.8 out of 10.