An interpretation conflict in WordPress Core (CVE-2026-63030) — chained with a second flaw to reach unauthenticated code execution
WordPress Core contains an interpretation conflict, where separate parts of the processing take the same input to mean different things. CISA added it to the KEV catalog on 2026-07-21 and records that chaining it with the SQL injection CVE-2026-60137 can yield unauthenticated remote code execution on default installations. The two were added the same day but carry due dates three days and fourteen days out.
Key facts
- CVE IDCVE-2026-63030
- Affected (vendor / product)WordPress Core
- CWECWE-436
- ExploitationListed in CISA KEV (exploitation confirmed)
- Remediation due2026-07-24 (U.S. federal civilian agencies, BOD 22-01)
Key points
- The affected product is WordPress Core; the name is "Interpretation Conflict Vulnerability," CWE-436.
- Chained with CVE-2026-60137 (SQL injection, CWE-89) it can yield unauthenticated remote code execution on default installations.
- An interpretation conflict is where processing layers take the same data to mean different things — danger can materialize even after an input check passes.
- Both were added to KEV on 2026-07-21; due dates are 2026-07-24 (three days) for this one and 2026-08-04 (fourteen) for the partner.
- Use in ransomware campaigns is recorded as not known for both.
- The two chained entries were both added on 2026-07-21 yet carry deadlines of three days and fourteen.
1What an interpretation conflict is
One piece of data taken to mean different things by different components along a processing path — that is an interpretation conflict. It shows up as input one layer judges to be a harmless string being treated by the next layer as part of a command. Danger materializes even though the input check passed, so tightening the check alone does not necessarily close it. That is why CWE-436 exists as a class distinct from injection or boundary violation.
2It works only when the two are joined
The catalog states explicitly that this can be chained with CVE-2026-60137, the SQL injection. The partner's description mirrors it: chained with CVE-2026-63030, it allows an unauthenticated attacker to gain remote code execution on default WordPress installations. Neither reaches that result alone; combining them does. It is a clear example of scoring vulnerabilities one at a time failing to capture attacks built on chains.
3Added the same day, with different deadlines
Both entered KEV on 2026-07-21. Yet the due dates differ: 2026-07-24 for this one — three days — and 2026-08-04 for the partner, fourteen. Because deadlines under BOD 26-04 are set according to risk, even a chained pair is not treated identically. From an operator's view that reads as a judgment that fixing one may already break the chain, though the catalog does not state a reason.
4Two chained entries carry different deadlines
This vulnerability reaches unauthenticated remote code execution only in combination with another. Both were added on the same day, yet their remediation dates differ.
| CVE | Class of vulnerability | Remediation date |
|---|---|---|
| CVE-2026-63030 (this record) | Interpretation conflict (CWE-436) | 24 July 2026, three days after listing |
| CVE-2026-60137 | SQL injection | 4 August 2026, fourteen days after listing |
Both were added on 21 July 2026. Because deadlines are set according to risk under BOD 26-04, even a chained pair is not handled identically. It reads as a judgement that fixing one first may already break the chain, though the catalog does not say so. Where the catalog names the CVE a vulnerability chains with, treating both as one piece of work is the practical approach.
Why it matters
Prioritizing vulnerabilities by individual score leaves out attacks built on chains. Where the catalog names a chaining partner, treating both as a single unit of work is the practical approach. For software underpinning public websites, whether the result is reachable on a default installation defines the blast radius, so assessment should not depend on assuming custom configuration.
FAQ
What is an interpretation conflict?
Why do the two have to be combined?
Why do same-day additions carry different deadlines?
Sources (primary)
This article is an independent organization based on the U.S. official data below. Always verify the exact, latest details and applicability with the official and vendor sources.
- CISA KEV Catalog (known exploited list)
- NVD (CVE details / CVSS)
- Vendor / reference advisory
- This product uses data from the NVD API but is not endorsed or certified by the NVD. KEV data is CC0 (public domain).