What is CVE-2023-47127?

CVE-2023-47127 is a medium-severity vulnerability in TYPO3, classified under Authentication Bypass by Assumed-Immutable Data. CVSS score: 4.2/10. Published 2023-11-14.

How severe is CVE-2023-47127?

Medium severity. CVSS v3 base score is 4.2 out of 10.

Auth bypass in TYPO3

CVE-2023-47127

TYPO3 is an open source PHP based web content management system released under the GNU GPL. In typo3 installations there are always at least two different sites. Eg. first.example.org and second.example.com. In affected versions a session cookie generated for the first site can be reused on the second site without requiring additional authentication. This vulnerability has been addressed in versions 8.7.55, 9.5.44, 10.4.41, 11.5.33, and 12.4.8. Users are advised to upgrade. There are no known workarounds for this vulnerability.

Published 2023-11-14 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 4.2 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.006 (44.5th percentile), scored 2026-09-30.

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 44th percentile — 44.5% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.006 · newest: 0.006 · change: 0.000

Affected products

TYPO3 — versions >= 8.0.0, < 8.7.55, >= 9.0.0, < 9.5.44, >= 10.0.0, < 10.4.41

Weakness classification (CWE)

References

github.com/TYPO3/typo3/security/advisories/GHSA-3vmm-7h4j-69rm (Vendor Advisory)
github.com/TYPO3/typo3/commit/535dfbdc54fd5362e0bc08d911db44eac7f64019 (Patch)
typo3.org/security/advisory/typo3-core-sa-2023-006 (Vendor Advisory)

Frequently asked questions

What is CVE-2023-47127?: CVE-2023-47127 is a medium-severity vulnerability in TYPO3, classified under Authentication Bypass by Assumed-Immutable Data. CVSS score: 4.2/10. Published 2023-11-14.
How severe is CVE-2023-47127?: Medium severity. CVSS v3 base score is 4.2 out of 10.