How severe is CVE-2026-27475?

CVE-2026-27475 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-27475 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27475?

CVE-2026-27475 affects Spip. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27475?

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

Does CVE-2026-27475 have an EU (EUVD) identifier?

Yes. CVE-2026-27475 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8322.

When was CVE-2026-27475 published?

CVE-2026-27475 was published on 2026-02-19 and last updated on 2026-06-17.

CVE-2026-27475

CVE-2026-27475 is a high-severity vulnerability in Spip with a CVSS 3.x base score of 8.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-502.

Key facts

Severity: High (CVSS 3.x base score 8.1)
CVSS v4: 9.2
EPSS exploit prediction: 1% (51st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-8322
Weakness: CWE-502
Affected product: Spip
Published: 2026-02-19
Last modified: 2026-06-17

Description

SPIP before 4.4.9 allows Insecure Deserialization in the public area through the table_valeur filter and the DATA iterator, which accept serialized data. An attacker who can place malicious serialized content (a pre-condition requiring prior access or another vulnerability) can trigger arbitrary object instantiation and potentially achieve code execution. The use of serialized data in these components has been deprecated and will be removed in SPIP 5. This vulnerability is not mitigated by the SPIP security screen.

Frequently asked questions

What is CVE-2026-27475?: SPIP before 4.4.9 allows Insecure Deserialization in the public area through the table_valeur filter and the DATA iterator, which accept serialized data. An attacker who can place malicious serialized content (a pre-condition requiring prior access or another vulnerability) can trigger arbitrary object instantiation and potentially achieve code execution. The use of serialized data in these components has been deprecated and will be removed in SPIP 5. This vulnerability is not mitigated by the SPIP security screen.
How severe is CVE-2026-27475?: CVE-2026-27475 has a CVSS 3.x base score of 8.1, rated high severity. It is exploitable over network with high attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-27475 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 1% (51st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27475?: CVE-2026-27475 affects Spip. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27475?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-27475 have an EU (EUVD) identifier?: Yes. CVE-2026-27475 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-8322.
When was CVE-2026-27475 published?: CVE-2026-27475 was published on 2026-02-19 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:spip:spip:*:*:*:*:*:*:*:*

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