b2evolution CMS versions 6.7.8 through 7.2.5 contain an incomplete fix for CVE-2016-8901 where the serialized-array object check in param_check_serialized_array() fails to reject payloads with negative integer array keys. Unauthenticated attackers can submit crafted serialized PHP objects via POST requests to htsrv/call_plugin.php that bypass validation and reach unserialize(), instantiating arbitrary PHP objects with attacker-chosen properties that may enable code execution if suitable POP gadget chains exist.
CVE-2026-76834
“—” beside the score: it is equal to the CVSS score beside it.
Score 8.1 from GitHub Security Advisory (severity: CRITICAL) published 2026-09-17. A secondary CVSS source baseline 8.1; sources differ by 0.0.
Also known asEUVD-2026-81681 (ENISA EUVD) · GHSA-2vrr-cgr4-gfmm (GitHub Security Advisories)Source: ENISA EUVD
- High severity, but no confirmed exploitation yet
A fix is available — apply it.
- CVSS v3
- 8.1
- EG Score
- 8.1HIGHmedium confidence
- EG Risk
- 37EG Risk 37/100
EG Risk is EchelonGraph's 0–100 priority score. It fuses impact severity (EG Severity, the CVSS base score, never the KEV-floored or EPSS-lifted EG Score) with real-world exploitation and automatability, under weights EchelonGraph set by hand, so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner.
How it’s computed (value × EchelonGraph’s weight)Severity81% × 45%Impact severity (EG Severity): CVSS 8.1 of 10. Never the KEV-floored or EPSS-lifted EG Score.Exploitation0.9% × 40%FIRST EPSS: the 30-day exploitation probability when EchelonGraph scored this CVE.Automatability0% × 15%CISA's SSVC Automatable value: no (Vulnrichment).SSVC (CISA's decision table, applied by EchelonGraph): Track at low or medium mission impact; Track* at high (mission-essential systems).Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE.Action: A fix is available. Apply it within your standard update timelines. - EPSS PROB
- 0.8%
- EPSS %ILE
- 58th
- KEV
- Not listed
What the EG score is made of (scorer v4.0: the three questions the 0–10 score mixes, published apart · methodology)
The EG score (8.1): severity, escalated by confirmed exploitation. This CVE's 8.1 is its impact severity (EG Severity), not escalated.
- EG Severity
- 8.1 HIGHCVSS-B, impact only: no KEV listing, EPSS or EG-KEV tier raises it.GitHub Security Advisory CVSS
- EG Likelihood
- 0.8% within 30 daysSource: FIRST EPSS (model v2026.06.15, score date 2026-10-29). FIRST's exploitation probability, not an EchelonGraph model.
- Confirmed exploitation
- None on record (CISA KEV, EG-KEV Tier 1)Reported apart from the likelihood: an observed fact, not a probability.
- EG Priority
- SSVC Track at medium mission impactTrack at low or medium mission impact; Track* at high (mission-essential systems).CISA BOD 26-04: 14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.Each input and its source, and whom BOD 26-04 binds: the SSVC and BOD 26-04 blocks below.
SSVC (CISA's decision table, applied by EchelonGraph)Track at low or medium mission impact; Track* at high (mission-essential systems).
A fix is available. Apply it within your standard update timelines.
Exploitation none (CISA Vulnrichment) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). All three are CISA's SSVC values (Vulnrichment). EchelonGraph applied CISA's decision table to them; CISA publishes SSVC inputs and the table, not a decision for each CVE. Mission impact is CISA's Mission & Well-being decision point, and only you can judge it. CISA's table makes it high when Mission Prevalence is Essential — the vulnerable component "directly provides capabilities that constitute at least one MEF for at least one entity" (MEF: mission essential function) — or when Public Well-Being Impact is Irreversible: "multiple fatalities are likely", the cyber-physical system "is likely lost or destroyed", "extreme or serious externalities" are imposed on other parties, or social systems such as elections or the financial grid "are destabilized and potentially collapse". CISA's decision table
BOD 26-04 (CISA's remediation timeline, Table 1)14 days if the affected system is publicly exposed; Fix on system upgrade if it is not.
The score's inputs: In CISA KEV no (CISA's KEV catalog) · Automatable no (CISA Vulnrichment) · Technical impact total (CISA Vulnrichment). Whether your system is publicly exposed is yours to answer. BOD 26-04 binds US Federal Civilian Executive Branch agencies; for anyone else it is CISA's published timeline, a reference rather than an obligation. The directive · how EchelonGraph applies it
Published
September 17, 2026
Last Modified
September 23, 2026
Advisory Details (8)
Auto-updated Sep 17, 2026b2evolution CMS 6.7.8 through 7.2.5 Object Injection via Negative Integer Array Key | Advisories | VulnCheck
https://www.vulncheck.com/advisories/b2evolution-cms-6.7.8-through-7.2.5-object-injection-via-negative-integer-array-keyGitHub - b2evolution/b2evolution: b2evolution CMS: Multiblog/CMS content publishing + forums + email marketing + social network + more... b2evolution includes everything you need to run and maintain a modern website. Optimized for low maintenance with easy upgrades and effective antispam. Full RWD & bootstrap support. · GitHub
https://github.com/b2evolution/b2evolutioncommit 335abf09bcea (b2evolution/b2evolution)
Patch available: b2evolution/b2evolution 6-9-4 (contains commit 335abf09bcea)
https://github.com/b2evolution/b2evolution/commit/335abf09bcea61717bd00bc1e3889f8100ebd1bbcommit 999b5ad1d597 (b2evolution/b2evolution)
Patch available: b2evolution/b2evolution 6-9-4 (contains commit 999b5ad1d597)
https://github.com/b2evolution/b2evolution/commit/999b5ad1d59760d7e450ceb541f55432fc74cd27commit 25c21cf9cc42 (b2evolution/b2evolution)
Patch available: b2evolution/b2evolution 6-9-4 (contains commit 25c21cf9cc42)
https://github.com/b2evolution/b2evolution/commit/25c21cf9cc4261324001f9039509710b37ee2c4db2evolution/htsrv/call_plugin.php at 7.2.5 · b2evolution/b2evolution · GitHub
https://github.com/b2evolution/b2evolution/blob/7.2.5/htsrv/call_plugin.php#L49b2evolution/inc/_core/_param.funcs.php at 7.2.5 · b2evolution/b2evolution · GitHub
https://github.com/b2evolution/b2evolution/blob/7.2.5/inc/_core/_param.funcs.php#L2860CVE-2026-76834 — PHP Object Injection in b2evolution CMS (Incomplete Fix of CVE-2016-8901) · GitHub
https://gist.github.com/axg11/3e29501c33f6e1e05ac2a00107afd64eVendor Advisories for CVE-2026-76834(1)
These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.
Weakness Classification(1)
MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.
Data Freshness Timeline
(refreshed 9× in last 7d / 68× in last 30d)
Each row is a time one of our pipelines fetched, updated or re-scored this CVE. 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. An arrow marks a change the record states ("CVSS v3 → 9.1"); EPSS and GHSA rows show the values recorded at that time, not what changed (EPSS values are rounded; hover one for the exact figures). Most recent first.
Showing the most recent 100 of 132 refreshes on record for this CVE.
A repeat, a row identical to one the same pipeline wrote less than 10 seconds earlier, is not a separate refresh and is not counted. None are among the latest 100 rows. The 32 oldest rows on record are not shown and were not checked, so the counts can still include repeats.
- 2026-11-01 16:35 UTCEPSS rescoreEPSS 0.8% · 58th percentile
- 2026-10-31 16:33 UTCEPSS rescoreEPSS 0.8% · 58th percentile
- 2026-10-30 16:35 UTCEPSS rescoreEPSS 0.8% · 58th percentile
- 2026-10-30 12:09 UTCEG score recompute
- 2026-10-30 12:09 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-29 16:34 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-28 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-27 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-26 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-25 16:34 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-25 14:01 UTCEG score recompute
- 2026-10-24 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-24 03:23 UTCEG score recompute
- 2026-10-24 03:23 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-23 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-22 16:35 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-21 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-20 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-19 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-18 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-18 03:12 UTCEG score recompute
- 2026-10-17 18:36 UTCEG score recompute
- 2026-10-17 18:36 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-17 16:35 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-16 16:44 UTCEPSS rescoreEPSS 0.8% · 57th percentile
Show 75 moreShow fewer
- 2026-10-15 16:32 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-14 16:33 UTCEPSS rescoreEPSS 0.8% · 57th percentile
- 2026-10-13 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-13 07:03 UTCEG score recompute
- 2026-10-13 07:03 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-12 16:35 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-12 15:38 UTCEG score recompute
- 2026-10-12 05:01 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-11 19:23 UTCEG score recompute
- 2026-10-11 16:39 UTCEG score recompute
- 2026-10-11 14:01 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-11 13:58 UTCEG score recompute
- 2026-10-11 13:49 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-11 00:01 UTCEG score recompute
- 2026-10-11 00:01 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-10 20:00 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-10 11:08 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-09 22:15 UTCEG score recompute
- 2026-10-09 22:15 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-09 20:07 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-09 09:22 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-08 20:29 UTCEG score recompute
- 2026-10-08 20:29 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-08 17:13 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-08 07:01 UTCEG score recompute
- 2026-10-08 07:01 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-07 23:48 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-07 18:08 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-07 04:35 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-06 15:42 UTCEG score recompute
- 2026-10-06 15:42 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-06 15:18 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-06 02:27 UTCEG score recompute
- 2026-10-06 02:27 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-05 17:43 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-05 13:34 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-05 00:39 UTCEG score recompute
- 2026-10-05 00:39 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-04 23:22 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-04 11:45 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-03 22:53 UTCEG score recompute
- 2026-10-03 22:53 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-03 14:26 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-03 10:00 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-02 20:42 UTCEG score recompute
- 2026-10-02 20:42 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-02 07:49 UTCEG score recompute
- 2026-10-02 07:49 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-01 19:50 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-10-01 18:52 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-10-01 05:57 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-30 17:04 UTCEG score recompute
- 2026-09-30 17:04 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-30 04:11 UTCEG score recompute
- 2026-09-30 04:11 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-29 15:24 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-09-29 15:15 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-29 02:23 UTCEG score recompute
- 2026-09-29 02:23 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-28 13:52 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-09-28 13:30 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-28 00:36 UTCEG score recompute
- 2026-09-28 00:36 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-27 13:48 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-09-27 11:43 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-26 22:41 UTCEG score recompute
- 2026-09-26 22:41 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-26 15:59 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-09-26 09:44 UTCEG score recompute
- 2026-09-26 09:44 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-26 00:28 UTCEPSS rescoreEPSS 0.8% · 56th percentile
- 2026-09-25 20:52 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-25 07:59 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
- 2026-09-24 19:06 UTCEG score recompute
- 2026-09-24 19:06 UTCGHSA enrichmentGHSA-2vrr-cgr4-gfmm · GitHub severity CRITICAL · GitHub CVSS 8.1
Related CVEs(same CWE)
Frequently asked(5)
What is CVE-2026-76834?
When was CVE-2026-76834 made public?
Is CVE-2026-76834 actively exploited?
What is the CVSS score of CVE-2026-76834?
How do I remediate CVE-2026-76834?
Dependency Blast Radius
Explore the affected products and dependency analysis for CVE-2026-76834
Is Your Infrastructure Affected by CVE-2026-76834?
EchelonGraph automatically scans your cloud infrastructure and maps CVE exposure using blast radius analysis.