How severe is CVE-2025-4691?

CVE-2025-4691 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.

Is CVE-2025-4691 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2025-4691?

CVE-2025-4691 affects Syntacticsinc Easync. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2025-4691?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2025-4691 have an EU (EUVD) identifier?

Yes. CVE-2025-4691 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16555.

When was CVE-2025-4691 published?

CVE-2025-4691 was published on 2025-05-31 and last updated on 2026-06-17.

CVE-2025-4691

CVE-2025-4691 is a medium-severity vulnerability in Syntacticsinc Easync with a CVSS 3.x base score of 5.3. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-639.

Key facts

Severity: Medium (CVSS 3.x base score 5.3)
EPSS exploit prediction: 0% (20th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2025-16555
Weakness: CWE-639
Affected product: Syntacticsinc Easync
Published: 2025-05-31
Last modified: 2026-06-17

Description

The Free Booking Plugin for Hotels, Restaurants and Car Rentals – eaSYNC Booking plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.3.21 via the 'view_request_details' due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to view the details of any booking request. The vulnerability was partially patched in versions 1.3.18 and 1.3.21.

Frequently asked questions

What is CVE-2025-4691?: The Free Booking Plugin for Hotels, Restaurants and Car Rentals – eaSYNC Booking plugin for WordPress is vulnerable to Insecure Direct Object Reference in all versions up to, and including, 1.3.21 via the 'view_request_details' due to missing validation on a user controlled key. This makes it possible for unauthenticated attackers to view the details of any booking request. The vulnerability was partially patched in versions 1.3.18 and 1.3.21.
How severe is CVE-2025-4691?: CVE-2025-4691 has a CVSS 3.x base score of 5.3, rated medium severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is low, integrity none, and availability none.
Is CVE-2025-4691 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (20th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2025-4691?: CVE-2025-4691 affects Syntacticsinc Easync. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2025-4691?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2025-4691 have an EU (EUVD) identifier?: Yes. CVE-2025-4691 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2025-16555.
When was CVE-2025-4691 published?: CVE-2025-4691 was published on 2025-05-31 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:syntacticsinc:easync:*:*:*:*:*:wordpress:*:*

More vulnerabilities in Syntacticsinc Easync

CVE-2022-1952 — Critical (CVSS 9.8): The Free Booking Plugin for Hotels, Restaurant and Car Rental WordPress plugin before 1.1.16 suffers from insufficient…
CVE-2023-38384 — High (CVSS 7.1): Unauth. Reflected Cross-Site Scripting (XSS) vulnerability in Syntactics, Inc. EaSYNC plugin <= 1.3.7 versions.
CVE-2024-9450 — Medium (CVSS 6.5): The Free Booking Plugin for Hotels, Restaurants and Car Rentals WordPress plugin before 1.3.15 does not have CSRF…

All CVEs affecting Syntacticsinc Easync →

Other CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities

CVE-2025-40805 — Critical (CVSS 10.0): Affected devices do not properly enforce user authentication on specific API endpoints. This could facilitate an…
CVE-2024-45032 — Critical (CVSS 10.0): A vulnerability has been identified in Industrial Edge Management Pro (All versions < V1.9.5), Industrial Edge…
CVE-2026-34037 — Critical (CVSS 9.9): Coolify is an open-source and self-hostable tool for managing servers, applications, and databases. Prior to…
CVE-2026-52782 — Critical (CVSS 9.9): OpenProject is open-source, web-based project management software. Prior to 17.3.3 and 17.4.1, there is an IDOR through…
CVE-2026-45552 — Critical (CVSS 9.9): Roxy-WI is a web interface for managing Haproxy, Nginx, Apache and Keepalived servers. In versions 8.2.6.4 and prior,…
CVE-2026-29200 — Critical (CVSS 9.9): A critical IDOR vulnerability has been discovered in Comet Backup affecting all versions from 20.11.0 to 26.1.1 and…

Browse all CWE-639 (Authorization Bypass Through User-Controlled Key (IDOR)) vulnerabilities →