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CVE-2021-43823

Side-channel attack in Sourcegraph

MEDIUM
6.5
CVSS Score
Published: December 13, 2021 at 07:55 PM UTC
Updated: June 17, 2026 at 04:11 AM UTC
1 product affected across 1 vendorSourcegraph

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Severity
MEDIUM6.5
Exploit prediction
EPSS 0.9%

Description

Sourcegraph is a code search and navigation engine. Sourcegraph prior to version 3.33.2 is vulnerable to a side-channel attack where strings in private source code could be guessed by an authenticated but unauthorized actor. This issue affects the Saved Searches and Code Monitoring features. A successful attack would require an authenticated bad actor to create many Saved Searches or Code Monitors to receive confirmation that a specific string exists. This could allow an attacker to guess formatted tokens in source code, such as API keys. This issue was patched in version 3.33.2 and any future versions of Sourcegraph. We strongly encourage upgrading to secure versions. If you are unable to, you may disable Saved Searches and Code Monitors.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Sourcegraph· Sourcegraph
95%
v < 3.33.2
Affected range stops below 3.33.2, so it looks safe — our inference, not a vendor statement

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (2)

x_refsource_MISCPatchThird Party Advisory
Source: [email protected]
https://github.com/sourcegraph/sourcegraph/commit/a88d90a8302c492282186d39718cd8fb093c14fa
x_refsource_CONFIRMThird Party Advisory
Source: [email protected]
https://github.com/sourcegraph/sourcegraph/security/advisories/GHSA-cpq7-hmvv-29w9

CVSS

6.5MEDIUMGitHub_M
Attack Vector
NETWORK
Complexity
LOW
Privileges
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality
HIGH
Integrity
NONE
Availability
NONE
Vector?

Quick Info

StatusMODIFIED
CWE
CWE-200CWE-203

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