Discourse up to 3.4.3/3.5.0.beta4/3.5.0.beta5-dev Setting allowed_iframes insecure automated optimizations

CVSS Meta Temp Score
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CTI Interest Score
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8.4$0-$5k0.00

Summaryinfo

A vulnerability labeled as critical has been found in Discourse up to 3.4.3/3.5.0.beta4/3.5.0.beta5-dev. Affected is the function allowed_iframes of the component Setting Handler. The manipulation results in insecure automated optimizations. This vulnerability is identified as CVE-2025-48877. The attack can be executed remotely. There is not any exploit available. The affected component should be upgraded.

Detailsinfo

A vulnerability classified as critical has been found in Discourse up to 3.4.3/3.5.0.beta4/3.5.0.beta5-dev. Affected is the function allowed_iframes of the component Setting Handler. The manipulation with an unknown input leads to a insecure automated optimizations vulnerability. CWE is classifying the issue as CWE-1038. The product uses a mechanism that automatically optimizes code, e.g. to improve a characteristic such as performance, but the optimizations can have an unintended side effect that might violate an intended security assumption. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Discourse is an open-source discussion platform. Prior to version 3.4.4 of the `stable` branch, version 3.5.0.beta5 of the `beta` branch, and version 3.5.0.beta6-dev of the `tests-passed` branch, Codepen is present in the default `allowed_iframes` site setting, and it can potentially auto-run arbitrary JS in the iframe scope, which is unintended. This issue is patched in version 3.4.4 of the `stable` branch, version 3.5.0.beta5 of the `beta` branch, and version 3.5.0.beta6-dev of the `tests-passed` branch. As a workaround, the Codepen prefix can be removed from a site's `allowed_iframes`.

The advisory is available at github.com. This vulnerability is traded as CVE-2025-48877 since 05/27/2025. The exploitability is told to be easy. It is possible to launch the attack remotely. The exploitation doesn't require any form of authentication. Technical details are known, but there is no available exploit.

Upgrading to version 3.4.4, 3.5.0.beta5 or 3.5.0.beta6-dev eliminates this vulnerability.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2025-17469). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Productinfo

Type

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CNA CVSS-B Score: 🔍
CNA CVSS-BT Score: 🔍
CNA Vector: 🔍

CVSSv3info

VulDB Meta Base Score: 8.5
VulDB Meta Temp Score: 8.4

VulDB Base Score: 7.3
VulDB Temp Score: 7.0
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 9.8
NVD Vector: 🔍

CVSSv2info

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VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Insecure automated optimizations
CWE: CWE-1038
CAPEC: 🔍
ATT&CK: 🔍

Physical: No
Local: No
Remote: Yes

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

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Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Discourse 3.4.4/3.5.0.beta5/3.5.0.beta6-dev

Timelineinfo

05/27/2025 🔍
06/09/2025 +13 days 🔍
06/09/2025 +0 days 🔍
09/26/2025 +108 days 🔍

Sourcesinfo

Product: github.com

Advisory: GHSA-cm93-6m2m-cjcv
Status: Confirmed

CVE: CVE-2025-48877 (🔍)
GCVE (CVE): GCVE-0-2025-48877
GCVE (VulDB): GCVE-100-311706
EUVD: 🔍

Entryinfo

Created: 06/09/2025 15:49
Updated: 09/26/2025 00:00
Changes: 06/09/2025 15:49 (69), 06/09/2025 17:21 (1), 09/26/2025 00:00 (13)
Complete: 🔍
Cache ID: 216::103

If you want to get best quality of vulnerability data, you may have to visit VulDB.

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