CVE-2024-43796 | express vulnerable to XSS via response.redirect()

Express.js minimalist web framework for node. In express < 4.20.0, passing untrusted user input - even after sanitizing it - to response.redirect() may execute untrusted code. This issue is patched in express 4.20.0.

Published: 2024-09-10 Last update: 2024-09-20 Assigner: [email protected] Source: [email protected]

NVD Status：Analyzed，CVE State: published

View at NVD, CVE.org, EUVD

Threat Intelligence & Risk Assessment for CVE-2024-43796

EPSS CVSS CWE GHSA Affected OS Tracker

Conclusion & alert: CVE-2024-43796 is rated Low Risk (33.2/100): CVSS Medium severity, with low exploitation likelihood (EPSS 0.47%). Mandatory action: Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2024-43796

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.07%	0.47%	+0.40%
2	2025-11-21	0.49%	0.07%	-0.42%
3	2025-11-18	—	0.49%	—

Full EPSS history (9 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2024-43796

CVSS metrics for this CVE.

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.0	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:L/A:L` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:L) Might cause slowdowns, glitches, or partial disruption—not a full brick.	1.6	3.4	[email protected]
4.7	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:C/C:L/I:L/A:N` Click to expand Attack vector (AV:N) Could be attacked over the internet or any normal routed network—not just someone sitting at the machine. Attack complexity (AC:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. Privileges required (PR:N) No account or special rights needed—anonymous or random user is enough. User interaction (UI:R) A real person has to do something—click, install, enable—otherwise it doesn’t land. Scope (S:C) Breaking this can reach past the original component and bite other resources—bigger blast radius. Confidentiality (C:L) Some sensitive info could get out, but not a total data dump. Integrity (I:L) Attackers could change some data, but it’s limited—not everything goes. Availability (A:N) Service keeps running; no real outage angle.	1.6	2.7	[email protected]

Weakness enumeration for CVE-2024-43796

CWE-79 MITRE ↗

GitHub Security Advisory for CVE-2024-43796

GHSA-qw6h-vgh9-j6wx · Severity: low · Ecosystem: npm — express vulnerable to XSS via response.redirect()

OS Trackers for CVE-2024-43796

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2024-43796 not yet assigned priority: Debian including 1 source packages (node-express), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2.	https://security-tracker.debian.org/tracker/CVE-2024-43796
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2024-43796
`ubuntu`	medium	CVE-2024-43796 medium priority: Ubuntu including 1 source packages (node-express), 9 status rows across 9 suites (bionic, focal, jammy, noble, oracular, plucky, questing, upstream, xenial): released 7, not-affected 2.	https://ubuntu.com/security/CVE-2024-43796

Affected software / configurations for CVE-2024-43796

Vendor	Product	Version	Raw CPE
openjsf	express	< 4.20.0	cpe:2.3:a:openjsf:express::::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:alpha1::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:alpha2::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:alpha3::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:alpha4::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:alpha5::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:alpha6::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:alpha7::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:alpha8::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:beta1::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:beta2::::node.js::*
openjsf	express	5.0.0	cpe:2.3:a:openjsf:express:5.0.0:beta3::::node.js::*

References for CVE-2024-43796

URL	Tags
https://github.com/expressjs/express/commit/54271f69b511fea198471e6ff3400ab805d6b553	Patch
https://github.com/expressjs/express/security/advisories/GHSA-qw6h-vgh9-j6wx	Vendor Advisory

cvelogic Threat Intelligence