VDB-374350 · CVE-2026-52783 · GCVE-0-2026-52783

opf openproject up to 17.3.2/17.4.0 Cache Backend cleartext storage in file

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 was found in opf openproject up to 17.3.2/17.4.0 and classified as problematic. This impacts an unknown function of the component Cache Backend. Executing a manipulation can lead to cleartext storage in file. This vulnerability is registered as CVE-2026-52783. It is possible to launch the attack remotely. No exploit is available. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability has been found in opf openproject up to 17.3.2/17.4.0 and classified as problematic. This vulnerability affects an unknown code of the component Cache Backend. The manipulation with an unknown input leads to a cleartext storage in file vulnerability. The CWE definition for the vulnerability is CWE-313. The product stores sensitive information in cleartext in a file, or on disk. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, OpenProject's Storages module writes the OneDrive/SharePoint userless OAuth access_token plaintext to Rails.cache under the deterministic key storage..httpx_access_token, repopulated continuously by an hourly cron and every userless-OAuth call site (see Write cadence). None of the three allowed cache backends (file_store, memcache, redis) encrypts at rest. An attacker with read access to the cache backend recovers the Azure-AD application-tier bearer with an anonymous get over the memcached binary protocol (or the equivalent against Redis). This vulnerability is fixed in 17.3.3 and 17.4.1.

The advisory is available at github.com. This vulnerability was named CVE-2026-52783 since 06/08/2026. The exploitation appears to be difficult. The attack can be initiated remotely. The technical details are unknown and an exploit is not available. This vulnerability is assigned to T1555 by the MITRE ATT&CK project.

Upgrading to version 17.3.3 or 17.4.1 eliminates this vulnerability.

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Productinfo

Type

Project Management Software

Vendor

Name

openproject

Version

Website

Product: https://github.com/opf/openproject/

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: 5.0
VulDB Temp Score: 4.8
VulDB Vector: 🔒
VulDB Reliability: 🔍

CNA Base Score: 8.2
CNA Vector (GitHub_M): 🔒

CVSSv2info

AV	AC	Au	C	I	A
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳
💳	💳	💳	💳	💳	💳

Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock
Unlock	Unlock	Unlock	Unlock	Unlock	Unlock

VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Cleartext storage in file
CWE: CWE-313 / CWE-312 / CWE-310
CAPEC: 🔒
ATT&CK: 🔒

Physical: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
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: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: openproject 17.3.3/17.4.1

Timelineinfo

06/08/2026 CVE reserved
06/26/2026 +18 days Advisory disclosed
06/26/2026 +0 days VulDB entry created
06/26/2026 +0 days VulDB entry last update

Sourcesinfo

Product: github.com

Advisory: github.com
Status: Confirmed

CVE: CVE-2026-52783 (🔒)
GCVE (CVE): GCVE-0-2026-52783
GCVE (VulDB): GCVE-100-374350

Entryinfo

Created: 06/26/2026 22:19
Changes: 06/26/2026 22:19 (64)
Complete: 🔍
Cache ID: 216::103