VDB-222641 · CVE-2023-27986 · EUVD-2023-31712

Emacs 28.1/28.2 Mailto URI code injection

CVSS Meta Temp Score CVSS is a standardized scoring system to determine possibilities of attacks. The Temp Score considers temporal factors like disclosure, exploit and countermeasures. The unique Meta Score calculates the average score of different sources to provide a normalized scoring system.	Current Exploit Price (≈) Our analysts are monitoring exploit markets and are in contact with vulnerability brokers. The range indicates the observed or calculated exploit price to be seen on exploit markets. A good indicator to understand the monetary effort required for and the popularity of an attack.	CTI Interest Score Our Cyber Threat Intelligence team is monitoring different web sites, mailing lists, exploit markets and social media networks. The CTI Interest Score identifies the interest of attackers and the security community for this specific vulnerability in real-time. A high score indicates an elevated risk to be targeted for this vulnerability.
6.5	$0-$5k	0.00

Summaryinfo

A vulnerability classified as critical has been found in Emacs 28.1/28.2. Affected by this issue is some unknown functionality of the component Mailto URI Handler. The manipulation leads to code injection. This vulnerability is documented as CVE-2023-27986. There is not any exploit available. It is suggested to install a patch to address this issue.

Detailsinfo

A vulnerability was found in Emacs 28.1/28.2 (Word Processing Software). It has been rated as critical. This issue affects some unknown processing of the component Mailto URI Handler. The manipulation with an unknown input leads to a code injection vulnerability. Using CWE to declare the problem leads to CWE-94. The product constructs all or part of a code segment using externally-influenced input from an upstream component, but it does not neutralize or incorrectly neutralizes special elements that could modify the syntax or behavior of the intended code segment. Impacted is confidentiality, integrity, and availability. The summary by CVE is:

emacsclient-mail.desktop in Emacs 28.1 through 28.2 is vulnerable to Emacs Lisp code injections through a crafted mailto: URI with unescaped double-quote characters.

The weakness was released 03/09/2023. The advisory is shared at git.savannah.gnu.org. The identification of this vulnerability is CVE-2023-27986 since 03/09/2023. Neither technical details nor an exploit are publicly available. MITRE ATT&CK project uses the attack technique T1059 for this issue.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at git.savannah.gnu.org.

The vulnerability is also documented in the vulnerability database at EUVD (EUVD-2023-31712). If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

Type

Word Processing Software

Name

Emacs

Version

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.6
VulDB Meta Temp Score: 6.5

VulDB Base Score: 5.5
VulDB Temp Score: 5.3
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 7.8
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Code injection
CWE: CWE-94 / CWE-74 / CWE-707
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: git.savannah.gnu.org

Timelineinfo

03/09/2023 🔍
03/09/2023 +0 days 🔍
03/09/2023 +0 days 🔍
12/01/2025 +998 days 🔍

Sourcesinfo

Advisory: git.savannah.gnu.org
Status: Confirmed

CVE: CVE-2023-27986 (🔍)
GCVE (CVE): GCVE-0-2023-27986
GCVE (VulDB): GCVE-100-222641
EUVD: 🔍

Entryinfo

Created: 03/09/2023 12:34
Updated: 12/01/2025 03:38
Changes: 03/09/2023 12:34 (40), 04/02/2023 08:38 (11), 12/01/2025 03:38 (16)
Complete: 🔍
Cache ID: 216:7C9:103