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CVE-2026-55808

Drupal core - Moderately critical - Improper validation - SA-CORE-2026-009

5.4 MediumFix available

CVE-2026-55808 is a medium vulnerability (CVSS 5.4) in Drupal, published June 17, 2026. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 0.27%, the 19th percentile. Fixed in drupal 10.5.12.

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0., from 0.0.0 to 11.1..

Attack profile

How easy it is to exploit

Attack vector
Network
Complexity
Low
Privileges needed
Low
User interaction
Required

What an attacker can affect

Confidentiality
Low
Integrity
Low
Availability
None

Exploit likelihood

0.27%Up 0.1 points since Jul 11, 2026
90%50%10%1%

What each source reports

CVE List Score used 5.4

Drupal core - Moderately critical - Improper validation - SA-CORE-2026-009

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0., from 0.0.0 to 11.1..

Record
CVE-2026-55808
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
EUVDEUVD-2026-43085 5.4

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0., from 0.0.0 to 11.1..

Record
EUVD-2026-43085
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Updated
2026-11-02
GitHub AdvisoriesGHSA-9wh5-5mcm-hf2j 5.4

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting")...

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0., from 0.0.0 to 11.1..

Record
GHSA-9wh5-5mcm-hf2j
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
NVD 5.4

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0., from 0.0.0 to 11.1..

Record
CVE-2026-55808
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSV 5.4

Drupal core - Moderately critical - Improper validation - SA-CORE-2026-009

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0., from 0.0.0 to 11.1..

Record
CVE-2026-55808
CVSS 3.1
5.4 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N
Weakness
CWE-79
Updated
2026-11-02
OSVBIT-drupal-2026-55808 No score

Drupal core - Moderately critical - Improper validation - SA-CORE-2026-009

Improper Neutralization of Input During Web Page Generation ("Cross-site Scripting") vulnerability in Drupal Drupal core allows Cross-Site Scripting (XSS). This issue affects Drupal core versions: from 0.0.0 to 10.5.12, from 10.6.0 to 10.6.11, from 11.2.0 to 11.2.14, from 11.3.0 to 11.3.12, from 0.0.0 to 11.0., from 0.0.0 to 11.1..

Record
BIT-drupal-2026-55808
Updated
2026-11-02
OSVDRUPAL-CORE-2026-009 No score

The JSON:API and REST modules allow you to upload image files to image fields.

The validation rules check the file extension of the uploaded file but not the file MIME type. This may allow a malicious user to upload a file that is not an image.

Certain web-server configurations may serve the uploaded file with its actual MIME type rather than an image type. This may lead to cross-site scripting (XSS) or other unexpected behavior.

Record
DRUPAL-CORE-2026-009
Updated
2026-11-02

Affected products

Affected packages

Affected packages
PackageAffectedFixed
drupal
Bitnami
 before 10.5.12, 10.6.0 up to 10.6.11, 11.0.0 up to 11.2.14, 11.3.0 up to 11.3.12
10.5.1210.6.1111.2.1411.3.12
drupal/core
Packagist
 before 10.5.12, 10.6.0 up to 10.6.11, 11.2.0 up to 11.2.14, 11.3.0 up to 11.3.12, 11.0.0 up to 11.1.0, 11.1.0 up to 11.2.0, plus listed versions
10.0.010.0.0-alpha110.0.0-alpha210.0.0-alpha310.0.0-alpha4
Show 45 moreShow less
10.0.0-alpha510.0.0-alpha610.0.0-alpha710.0.0-beta110.0.0-beta210.0.0-rc110.0.0-rc210.0.0-rc310.0.110.0.1010.0.1110.0.210.0.310.0.410.0.510.0.610.0.710.0.810.0.910.1.010.1.0-alpha110.1.0-beta110.1.0-rc110.1.110.1.210.1.310.1.410.1.510.1.610.1.710.1.810.2.010.2.0-alpha110.2.0-beta110.2.0-rc110.2.110.2.1010.2.1110.2.1210.2.210.2.310.2.410.2.510.2.610.2.7
10.5.1210.6.1111.2.1411.3.1211.1.011.2.0

History

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

References

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Left out here: 422 versions. The JSON record has them.

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