Non-constant time HMAC comparison in Adyen plugin in Saleor

published 2023-05-25 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-36924

cvss: 4.8; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.3%; EPSS 0.3% chance of exploitation in 30 days, percentile 27%
public exploits: 0; none known

Saleor Core is a composable, headless commerce API. Saleor's `validate_hmac_signature` function is vulnerable to timing attacks. Malicious users could abuse this vulnerability on Saleor deployments having the Adyen plugin enabled in order to determine the secret key and forge fake events, this could affect the database integrity such as marking an order as paid when it is not. This issue has been patched in versions 3.7.68, 3.8.40, 3.9.49, 3.10.36, 3.11.35, 3.12.25, and 3.13.16.

Patch / fix

fixed in 1 links 1

saleor saleor 3.7.68, 3.8.40, 3.9.49, 3.10.36, 3.11.35, 3.12.25, 3.13.16

github.com/saleor/saleor@1328274 commit

CISA SSVC

Exploitation: none
Automatable: no
Technical impact: partial
Assessed: 21 mo ago (2025-01-16)

Exploit prediction

0.34% chance of exploitation in the next 30 days, higher than 27% of all scored CVEs (FIRST EPSS, 2026-11-08).

CVSS scores

assigned by	version	score	vector
CNA	3.1	4.8	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N

Affected products

saleor saleor

Classification

Weakness

CWE-203 Observable Discrepancy
CWE-208 Observable Timing Discrepancy

References

Sources

CVE List CVE-2023-32694
NVD CVE-2023-32694

Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.

Summary