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CVE-2026-27475

SPIP < 4.4.9 Insecure Deserialization

9.2 CriticalPublic exploitFix available

CVE-2026-27475 is a critical vulnerability (CVSS 9.2) in Spip, published February 19, 2026. Public exploit code exists. EPSS puts the chance of exploitation in the next 30 days at 0.91%, the 60th percentile. Fixed in spip 4.4.11+dfsg-0+deb13u1.

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.

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
None
User interaction
None

What an attacker can affect

Confidentiality
High
Integrity
High
Availability
High

Exploit likelihood

0.91%Up 0.9 points since Feb 20, 2026
90%50%10%1%

What each source reports

CVE List Score used 9.2

SPIP < 4.4.9 Insecure Deserialization

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.

Record
CVE-2026-27475
CVSS 4.0
9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02
EUVDEUVD-2026-8322 9.2

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.

Record
EUVD-2026-8322
CVSS 4.0
9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-hxjp-v4qc-fcjg 9.2

SPIP before 4.4.9 allows Insecure Deserialization in the public area through the table_valeur...

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.

Record
GHSA-hxjp-v4qc-fcjg
CVSS 4.0
9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-502
Updated
2026-11-02
NVD 9.2

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.

Record
CVE-2026-27475
CVSS 4.0
9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness
CWE-502
Updated
2026-11-02
OSV 9.2

SPIP < 4.4.9 Insecure Deserialization

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.

Record
CVE-2026-27475
CVSS 4.0
9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Updated
2026-11-02
OSVDEBIAN-CVE-2026-27475 9.2

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.

Record
DEBIAN-CVE-2026-27475
CVSS 4.0
9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Updated
2026-11-02
OSVUBUNTU-CVE-2026-27475 9.2

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.

Record
UBUNTU-CVE-2026-27475
CVSS 4.0
9.2 CriticalCVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
CVSS 3.1
8.1 HighCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
spip
Debian:13
before 4.4.11+dfsg-0+deb13u1, plus listed versions
4.4.10+dfsg-14.4.3+dfsg-14.4.3+dfsg-1+deb13u14.4.4+dfsg-14.4.5+dfsg-1
Show 4 moreShow less
4.4.6+dfsg-14.4.7+dfsg-14.4.8+dfsg-14.4.9+dfsg-1
4.4.11+dfsg-0+deb13u1
spip
Debian:14
before 4.4.9+dfsg-1, plus listed versions
4.4.3+dfsg-14.4.4+dfsg-14.4.5+dfsg-14.4.6+dfsg-14.4.7+dfsg-14.4.8+dfsg-1
4.4.9+dfsg-1
spip
Ubuntu:Pro:16.04:LTS
All versions, plus listed versions
3.0.20-13.0.21-13.0.21-1ubuntu13.0.21-1ubuntu1+esm1
None known
spip
Ubuntu:Pro:18.04:LTS
All versions, plus listed versions
3.1.4-33.1.4-4~deb9u3build0.18.04.13.1.4-4~deb9u5build0.18.04.13.1.4-4~deb9u5ubuntu0.1~esm2
None known
spip
Ubuntu:Pro:20.04:LTS
All versions, plus listed versions
3.2.4-13.2.5-13.2.7-13.2.7-1ubuntu0.13.2.7-1ubuntu0.1+esm2
None known
spip
Ubuntu:22.04:LTS
All versions, plus listed versions
3.2.11-33.2.12-14.0.2-14.0.4-1
None known
spip
Ubuntu:24.04:LTS
All versions, plus listed versions
4.1.11+dfsg-14.1.12+dfsg-14.1.13+dfsg-14.1.15+dfsg-14.2.9+dfsg-2
None known
spip
Ubuntu:25.10
All versions, plus listed versions
4.3.8+dfsg-14.4.3+dfsg-1
None known
spip
Ubuntu:26.04:LTS
All versions, plus listed versions
4.4.3+dfsg-14.4.6+dfsg-14.4.7+dfsg-14.4.8+dfsg-14.4.9+dfsg-1
None known

Public exploits

Links only. Every CVE stores no exploit code.

Public exploits
SourceLinkDate
PoC in GitHubTrachinus/CVE-2026-274752026-09-01

History

History
WhenChangedSources
2026-11-02createdCVE List, EUVD, GitHub Advisories, NVD, OSV, PoC in GitHub

References

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