GZ Scripts Availability Booking Calendar PHP HTTP POST Request index.php cross site scripting

published 2023-07-27 3 y ago modified 2026-06-17 4 mo ago also EUVD-2023-44594

cvss: 3.5; version 3.1, CNA
cisa kev: Not listed; not in CISA's catalog
epss: 0.6%; EPSS 0.6% chance of exploitation in 30 days, percentile 47%
public exploits: 0; none known

A vulnerability, which was classified as problematic, has been found in GZ Scripts Availability Booking Calendar PHP 1.0. Affected by this issue is some unknown functionality of the file index.php of the component HTTP POST Request Handler. The manipulation of the argument promo_code leads to cross site scripting. The attack may be launched remotely. The exploit has been disclosed to the public and may be used. The identifier of this vulnerability is VDB-235568.

Exploit prediction

0.56% chance of exploitation in the next 30 days, higher than 47% of all scored CVEs (FIRST EPSS, 2026-11-08).

Exploits and checks

seclists.org https://seclists.org/fulldisclosure/2023/Jul/51 referenced PoC, tagged "exploit" by a source, unverified

CVSS scores

assigned by	version	score	vector
CNA	3.1	3.5	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
CNA	3.0	3.5	CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:L/A:N
CNA	2.0	4.0	AV:N/AC:L/Au:S/C:N/I:P/A:N
NVD	3.1	5.4	CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:N

Affected products

GZ Scripts Availability Booking Calendar PHP

Classification

Weakness

CWE-79 Improper Neutralization of Input During Web Page Generation

References

seclists.org /fulldisclosure/2023/Jul/51
exploit, mailing-list, third-party-advisory
vuldb.com /?id.235568
vdb-entry, technical-description, third-party-advisory
vuldb.com /?ctiid.235568
signature, permissions-required, third-party-advisory

Sources

CVE List CVE-2023-3969
NVD CVE-2023-3969

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