CVE-2018-20556

HIGHNVD 8.88.8—Elevated

8.8

EchelonGraph verdictPlan a fixSerious severity, but no confirmed exploitation yet.

High severity, but no confirmed exploitation yet

CISA-KEV: Not listedEPSS: 19%CVSS: 8.8Exploit: NoneExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

SQL injection vulnerability in Booking Calendar plugin 8.4.3 for WordPress allows remote attackers to execute arbitrary SQL commands via the booking_id parameter.

CVSS v3: 8.8
EG Score: 8.8(medium)
EPSS: 97.0%
KEV: Not listed

Published

March 21, 2019

Last Modified

November 21, 2024

References (8)

cve@mitrehttp://packetstormsecurity.com/files/151692/WordPress-Booking-Calendar-8.4.3-SQL-Injection.html
cve@mitrehttps://gist.github.com/B0UG/a750c2c204825453e6faf898ea6d09f6
cve@mitrehttps://vulners.com/exploitdb/EDB-ID:46377
cve@mitrehttps://www.exploit-db.com/exploits/46377/
af854a3a-2127-422b-91ae-364da2661108http://packetstormsecurity.com/files/151692/WordPress-Booking-Calendar-8.4.3-SQL-Injection.html
af854a3a-2127-422b-91ae-364da2661108https://gist.github.com/B0UG/a750c2c204825453e6faf898ea6d09f6
af854a3a-2127-422b-91ae-364da2661108https://vulners.com/exploitdb/EDB-ID:46377
af854a3a-2127-422b-91ae-364da2661108https://www.exploit-db.com/exploits/46377/

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-89SQL Injection

Data Freshness Timeline

(refreshed 12× in last 7d / 50× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

2026-06-25 13:47 UTCEPSS rescore
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2026-06-10 22:16 UTCEPSS rescore
2026-06-10 13:19 UTCEPSS rescore
2026-06-08 14:14 UTCEPSS rescore
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2026-06-07 15:22 UTCEPSS rescore
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2026-06-06 13:45 UTCEPSS rescore
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2026-06-01 13:50 UTCEPSS rescore
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2026-05-31 22:29 UTCEPSS rescore
2026-05-31 00:14 UTCEPSS rescore
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2026-05-29 13:41 UTCEPSS rescore
2026-05-28 13:42 UTCEPSS rescore
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2026-05-27 21:40 UTCEG score recompute
2026-05-27 21:40 UTCGHSA enrichment
2026-05-27 13:38 UTCEPSS rescore
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2026-05-26 07:17 UTCEPSS rescore
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Publicly available exploits

(1 reference)

Working exploit code is in the public domain (1 Exploit-DB entry). Defenders should treat patch urgency accordingly — public PoCs typically lead to mass-exploitation within 24-72 hours.

Exploit-DBEDB-46377
First seen Feb 14, 2019
WordPress Plugin Booking Calendar 8.4.3 - (Authenticated) SQL Injection
Open source ↗

Frequently asked(5)

What is CVE-2018-20556?

CVE-2018-20556 is a high vulnerability published on March 21, 2019. SQL injection vulnerability in Booking Calendar plugin 8.4.3 for WordPress allows remote attackers to execute arbitrary SQL commands via the booking_id parameter.

When was CVE-2018-20556 disclosed?

CVE-2018-20556 was first published in the National Vulnerability Database on March 21, 2019, with the most recent update on November 21, 2024. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2018-20556 actively exploited?

CVE-2018-20556 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 97.0% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2018-20556?

CVE-2018-20556 has a CVSS v3 base score of 8.8 (NVD).

How do I remediate CVE-2018-20556?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2018-20556, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2018-20556

📅 Published

🔄 Last Modified

🔗 References (8)

Weakness Classification(1)

Data Freshness Timeline

Publicly available exploits

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2018-20556?

🔗 Related CVEs(same CWE)

Same CWE

Published

Last Modified

References (8)

Frequently asked(5)

Related CVEs(same CWE)