7.8

CVE-2026-0859: TYPO3 CMS Allows Insecure Deserialization via Mailer File Spool

Analyzed
Published 13-01-2026Last modified 13-01-2026

Vulnerability summary

CVE-2026-0859 is a high (CVSS 7.8) Deserialization of Untrusted Data vulnerability in typo3. EPSS estimates a 0.18% chance of exploitation in the next 30 days, higher than 8% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.2, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.18%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Timeline

  1. 13-01-2026
    PublishedVulnerability first disclosed.
  2. 13-01-2026
    Last modifiedVulnerability information updated.

Description

TYPO3's mail‑file spool deserialization flaw lets local users with write access to the spool directory craft a malicious file that is deserialized during the mailer:spool:send command, enabling arbitrary PHP code execution on the web server. This issue affects TYPO3 CMS versions 10.0.0-10.4.54, 11.0.0-11.5.48, 12.0.0-12.4.40, 13.0.0-13.4.22 and 14.0.0-14.0.1.

CVSS metrics

3 scores · 2 sources · 2 versions

EPSS trend

Probability

0.18%

Chance of exploitation in the next 30 days

Percentile

8%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.19% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Typo32 products
  • typo3≥ 10.0.0, < 10.4.55 | ≥ 11.0.0, < 11.5.49 | ≥ 12.0.0, < 12.4.41 | ≥ 13.0.0, < 13.4.23 | ≥ 14.0.0, < 14.0.2
  • typo3 cms≥ 10.0.0, < 10.4.55 | ≥ 11.0.0, < 11.5.49 | ≥ 12.0.0, < 12.4.41 | ≥ 13.0.0, < 13.4.23 | ≥ 14.0.0, < 14.0.2

1 vendor · 2 products

References

4 links