CVE-2023-29454 [Medium] | Input Validation Bypass in Frontend

Stored or persistent cross-site scripting (XSS) is a type of XSS where the attacker first sends the payload to the web application, then the application saves the payload (e.g., in a database or server-side text files), and finally, the application unintentionally executes the payload for every victim visiting its web pages.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-07	0.65%	0.81%	+0.16%
2	2026-01-30	0.41%	0.65%	+0.23%
3	2025-11-21	—	0.41%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-07

0.65%

0.81%

+0.16%

2026-01-30

0.41%

0.65%

+0.23%

2025-11-21

—

0.41%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.4	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/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:L) A normal user session is enough; they don’t have to be admin. 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:H) Serious risk that confidential data gets exposed in a big way. 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.	1.2	4.2	[email protected]
5.4	3.1	MEDIUM	`CVSS:3.1/AV:N/AC:L/PR:L/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:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. 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.	2.3	2.7	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.4

3.1

MEDIUM

CVSS:3.1/AV:N/AC:H/PR:L/UI:R/S:U/C:H/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:L): A normal user session is enough; they don’t have to be admin.
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:H): Serious risk that confidential data gets exposed in a big way.
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.

1.2

4.2

[email protected]

5.4

3.1

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/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:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
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.

2.3

2.7

[email protected]

OS Trackers for CVE-2023-29454

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2023-29454 not yet assigned priority: Debian including 1 source packages (zabbix), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 4, open 1.	https://security-tracker.debian.org/tracker/CVE-2023-29454
`ubuntu`	medium	CVE-2023-29454 medium priority: Ubuntu including 1 source packages (zabbix), 13 status rows across 13 suites (bionic, focal, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): ignored 5, not-affected 3, needed 2, DNE 1, needs-triage 1, released 1.	https://ubuntu.com/security/CVE-2023-29454

Affected software / configurations for CVE-2023-29454

Vendor	Product	Version	Raw CPE
zabbix	frontend	>= 4.0.0, <= 4.0.45	cpe:2.3:a:zabbix:frontend::::::::
zabbix	frontend	>= 5.0.0, <= 5.0.33	cpe:2.3:a:zabbix:frontend::::::::
zabbix	frontend	>= 6.0.0, <= 6.0.16	cpe:2.3:a:zabbix:frontend::::::::

References for CVE-2023-29454

URL	Tags
https://lists.debian.org/debian-lts-announce/2023/08/msg00027.html
https://support.zabbix.com/browse/ZBX-22985	Vendor Advisory
https://lists.debian.org/debian-lts-announce/2024/10/msg00000.html

URL

CVE-2023-29454 | Persistent XSS in the user form

Exploit prediction scoring system (EPSS) score for CVE-2023-29454

Common vulnerability scoring system (CVSS) metrics for CVE-2023-29454

Weakness enumeration for CVE-2023-29454

OS Trackers for CVE-2023-29454

Affected software / configurations for CVE-2023-29454

References for CVE-2023-29454