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CVE-2018-20556

47
FAUCET Score

CVE-2018-20556 is a high-severity SQL injection vulnerability affecting Booking Calendar plugin version 8.4.3 for WordPress, allowing authenticated remote attackers to execute arbitrary SQL commands. The vulnerability has a CVSS score of 8.8 (High) due to its network-based attack vector, low attack complexity, and high impact on confidentiality, integrity, and availability. While not listed in CISA KEV, exploit code is publicly available on ExploitDB, though there is no evidence of active widespread exploitation or significant community discussion.

Impacted Technologies

VendorProductVersion(s)CPE
8.4.3CPE matchmatch criteria
cpe:2.3:a:booking_calendar_project:booking_calendar:8.4.3:*:*:*:*:wordpress:*:*

CVSS Data

CVSS version used by this source: 3.0

8.8HIGH

CVSS:3.0/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
Exploitability Score
2.8
Impact Score
5.9
CvssVersion
3.0

Exploit Intelligence

EPSS Score
18.91%
Probability of exploitation in next 30 days
EPSS Percentile
97.0%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
ExploitDB: EDB-46377 · Feb 14, 2019
This CVE's current EPSS score of 0.1891 is in the 96th percentile among its peer group of 17,829 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.3 Bluesky, 0.1 Mastodon, and 0.2 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Remediation records are not available for this CVE.

References

packetstormsecurity.com / files/151692/WordPress-Booking-Calendar-8.4.3-SQL-Injection.html
ExploitThird Party AdvisoryVDB Entry
gist.github.com / B0UG/a750c2c204825453e6faf898ea6d09f6
vulners.com / exploitdb/EDB-ID:46377
exploit-db.com / exploits/46377
ExploitThird Party AdvisoryVDB Entry